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Rationally engineered IR-783 octanoate as an enzyme-activatable fluorogenic tool for functional imaging of hNotum in living systems
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Lilin Songa, c, 1, Mengru Sunb, 1, Yuqing Songb, Feng Zhangb, Bei Zhaob, Hairong Zengb, Jinhui Shib, Huixin Liud, Shanshan Zhaoe, Tian Tianb, *, Heng Yina, c, Guangbo Geb, *
Chinese Chemical Letters | 2024, 35(11) : 109601
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Chinese Chemical Letters | 2024, 35(11): 109601
• Communication •
Rationally engineered IR-783 octanoate as an enzyme-activatable fluorogenic tool for functional imaging of hNotum in living systems
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Lilin Songa, c, 1, Mengru Sunb, 1, Yuqing Songb, Feng Zhangb, Bei Zhaob, Hairong Zengb, Jinhui Shib, Huixin Liud, Shanshan Zhaoe, Tian Tianb, *, Heng Yina, c, Guangbo Geb, *
Affiliations
  • a Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • b Shanghai Frontiers Science Center of TCM Chemical Biology, Institute of Interdisciplinary Integrative Medicine Re-search, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
  • c University of Chinese Academy of Sciences, Beijing 100049, China
  • d Health Sciences Institute, China Medical University, Shenyang 110122, China
  • e Department of Gynecology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang 110042, China
Published: 2024-11-15 doi: 10.1016/j.cclet.2024.109601
Outline
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As a vital negative regulator of Wnt signaling pathway, human Notum (hNotum) plays a crucial regulatory role in the progression of many human diseases. Deciphering the relevance of hNotum to human diseases requires practical and reliable tools for visualizing hNotum activity in living systems. Herein, an enzyme-activatable fluorogenic tool (IR-783 octanoate) was rationally engineered for sensing and imaging hNotum activity in living systems by integrating computer-aided molecular design and biochemical assays. IR-783 octanoate showed good optical properties, excellent specificity and high binding-affinity towards hNotum (Km = 0.98 µmol/L). IR-783 octanoate could be well up-taken into the cancerous cells or tumors that over-expressed organic anion transporting polypeptides (OATPs), and then hydrolyzed by cellular hNotum to release free IR-783 ketone, which created brightly fluorescent signals around 646 nm. Further investigations showed that IR-783 octanoate achieved a good performance for in-situ functional imaging of hNotum in both living cells, cancerous tissues and organs. It was also found that some SW620 cells with multipolar spindles could be stained by IR-783 octanoate to emit extremely bright signals, suggesting that this agent could be used as a novel visualizing tool for tracing the cells undergoing abnormal cell mitoses. Collectively, this study devises a highly specific fluorogenic tool for in-situ functional imaging of hNotum in living systems, which offers a practical and reliable tool to dynamically track the changes in hNotum activity under various conditions.

hNotum  /  Optical substrate  /  Computer-aided molecular design  /  In-situ functional imaging  /  Cancer diagnosis
Lilin Song, Mengru Sun, Yuqing Song, Feng Zhang, Bei Zhao, Hairong Zeng, Jinhui Shi, Huixin Liu, Shanshan Zhao, Tian Tian, Heng Yin, Guangbo Ge. Rationally engineered IR-783 octanoate as an enzyme-activatable fluorogenic tool for functional imaging of hNotum in living systems[J]. Chinese Chemical Letters, 2024 , 35 (11) : 109601 - . DOI: 10.1016/j.cclet.2024.109601
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Human Notum (hNotum), a secreted extracellular palmitoleoyl protein carboxylesterase, is known for regulating the Wnt signaling pathway by a negative feedback mechanism and is implicated in many physiological processes [1-5]. Under physiological conditions, hNotum removes the palmitoleoyl of mature Wnt proteins and destroys the affinity between Wnt proteins and their receptors (such as Frizzled receptor), thereby down-regulates the Wnt signaling pathway [4,6-8]. As a key regulator of Wnt signaling pathway, hNotum plays crucial roles in the progression of a suite of human diseases, including Alzheimer's disease [9,10], osteoporosis [11-14], intestinal diseases [15,16] and Apc-mutant colorectal cancer [5,17]. Recent investigations have revealed that hNotum could also regulate or interact with other tumor-associated signaling pathways including Hedgehog signaling pathway [18], phosphoinositide 3-kinase-Ak strain transforming (PI3K/AKT) signaling pathway [19] and transforming growth factor-beta (TGF-β) signaling pathway [5], which in turn, regulating the tumorigenesis, stemness and progression across various tumor types. Although it has been reported that hNotum is overexpressed in multiple cancers, such as primary hepatocellular carcinoma [20], gastric cancer [19], colorectal cancer [5,17,21-24] and oral squamous cell carcinoma [18], the relevance of hNotum to malignancies and other human diseases have not been fully investigated.
Tracking and visualizing the dynamical changes in hNotum activity in living systems under various conditions will strongly facilitate the scientists to deeply understand the biological roles of hNotum in the progression of a suite of human diseases. To decipher the revelation of hNotum activity to human diseases, the practical and reliable tools for sensing and visualizing hNotum activity in living systems are highly desirable [25]. Currently, trisodium 8-octanoyloxypyrene-1,3,6-trisulfonate (OPTS) is the most commonly used optical substrate for hNotum, but it could not be applied in living systems owing to its poor selectivity [26,27]. More recently, our groups have successfully devised two optical substrates for hNotum, namely octanoyl luciferin (OL) [28] and 3-O-methyl-6-O-octanoylfluorescein (MOF) [29]. As a bioluminescent substrate, OL cannot be used for functional imaging of hNotum at the subcellular level with high spatial resolution, while the detection wavelength of MOF is less than the first biological transparency window (650–950 nm) [30], which greatly limit their applications in living systems. Thus, the practical hNotum optical substrates with excellent specificity, long detection wavelengths and high spatial resolution are highly desirable.
Previous studies have revealed that hNotum prefers to hydrolyze chemically diverse octanoates, from small molecules (such as p-nitrophenol octanoate, octanoyl luciferin) to biomacromolecules (such as octanoylated ghrelin) [7,28,31]. The substrate promiscuities of hydrolases pose a significant challenge in developing highly specific optical tools for hNotum in the presence of various esterases in humans. It is noteworthy that the catalytic center of hNotum, Ser232, is located at the entrance of the catalytic cavity (Fig. 1a), whereas the catalytic serine residues of other human serine hydrolases, such as carboxylesterases (CESs) and cholinesterases (ChEs), are typically found in the deeper parts of the catalytic cavity (Fig. 1c and Fig. S2 in Supporting information). The superficial location of catalytic Ser232 in hNotum allows for less stringent restrictions on the sizes of the alcohol moieties of substrates compared to other esterases, which are usually limited by the shapes of their catalytic cavities. This unique structural feature suggests that it is feasible to design some "T-shaped" esters (Figs. 1c and 2) as highly specific substrates for hNotum, by introducing a significant lateral steric hindrance surrounding the ester group.
Following reviewing the structural features of the commonly used fluorescent dyes with long emission wavelengths and excellent photophysical properties, we found that heptamethine cyanine (Cy7) dyes are ideal skeletons for developing hNotum substrates [32-37]. Firstly, the modifiable chlorines of Cy7 dyes are situated in the middle of heptamethine chains and can be easily modified to form "T-shaped" Cy7 esters [38]. As shown in Fig. 2, when neglecting the N-substituent of cyanine esters, the cyanine skeleton with lateral planar conjugated structures looks like a long plank, which is simplified as the horizontal line of the letter T; the fatty acyl group is located at the mesoposition of cyanine sleleton, it looks like the vertical line of letter T. Therefore, the cyanine esters were termed as "T-shaped" molecules. Secondly, the N-substituent groups of Cy7 esters can be further improved to enhance their binding affinities towards hNotum by enhancing the interactions with the residues on the surface of hNotum (Figs. 1b and c) [32-34]. Moreover, Cy7 ketones generate brightly fluorescence signals with long-wavelength emission that fall within the first biological transparency window (650–950 nm), making them advantageous for imaging in living systems due to their high signal-to-noise ratios and deep tissue penetration [30,38]. In brief, Cy7 esters are excellent candidates for designing and developing fluorescent substrates for hNotum, due to their ideal structural features and excellent optical properties. To validate this assumption ("T-shaped" Cy7 esters were ideal hNotum substrates), a suite of Cy7 octanoates (Fig. 2) were designed, while computer-aided molecular design (CAMD) technology was used to assess the potentials of these Cy7 esters as hNotum substrates.
To evaluate the potentials of the designed Cy7 esters as hNotum substrates, each ligand was docked into the catalytic cavity of hNotum and then ranked based on the minimum ΔG of all hydrolytic conformations. The hydrolytic conformations should meet the following two requirements. Firstly, the distance between the ester bond and hNotum catalytical Ser232 should be less than 3.3 Å to allow nucleophilic attack by Ser232 [7]. Secondly, the octanoyl groups of the esters should be located in the hydrophobic pocket of hNotum. As shown in Table S2 (Supporting information), ligands 8 and 9 were excluded initially due to the lack of any hydrolytic conformations. Ligands 2 and 4 exhibited remarkably high binding-affinities with hNotum, both esters carried N-butylsulfonyl groups. However, ligand 10, which also had two N-butylsulfonyl groups, did not show a high affinity towards hNotum, possibly due to the steric hindrance caused by the methyl groups.
To investigate the influence of N-butylsulfonyl on the binding modes of ligands 2 and 4, molecular dynamics (MD) simulations and the molecular mechanics/Poisson–Boltzmann surface area (MM/PBSA) analyses were performed [39]. Fig. S3a (Supporting information) illustrated the unstable binding of ligand 4 to hNotum, which likely cause by the significant steric hindrance of benzoindole moieties. In the case of ligand 2, Arg145, Arg156 and Arg394 made significantly larger contributions compared to other residues (Fig. S3b in Supporting information). As shown in Fig. S3c (Supporting information), three arginine residues could interact with the sulfonic tails via Coulomb interactions. Despite the octanoyl group of ligand 4 leaving the hydrophobic pocket during MD simulations, the sulfonic tails of ligand 4 remained tightly bound to these arginine residues, keeping ligand 4 on the surface of hNotum (Figs. S3b and d in Supporting information). Correspondingly, ligands 6 and 7 with alkaline N-substituent groups exhibited the worst ΔG values, while ligand 5 with less acidic N-butylcarboxyl moieties also had a higher ΔG than ligand 2. These findings reinforce the notion that the interactions between N-butylsulfonyl groups and the arginine residues on the surface of hNotum primarily contributes to the tight binding of ligand 2 or 4 with hNotum (Table S2). Notably, parts of the arginine residues located on the surface of hNotum also play key roles on the binding of endogenous glypicans bearing sulfated glycans [7], which inspired us to improve the binding affinity of substrate candidates by introducing sulfonyl groups on Cy7 esters. In this study, it is also found that N-butylsulfonyl groups of both ligands 2 and 4 could create strong interactions with the arginines surrounding the catalytic Ser232, suggesting that these N-butylsulfonyl groups play a crucial role in improving the binding affinities of these two ligands with hNotum.
To predict the specificities of ligands 2 and 4 towards hNotum, these two esters were then docked with six other abundant serine hydrolases in humans. As shown in Table S3 (Supporting information), both ligands 2 and 4 could not form any hydrolytic conformations in these six human esterases (including human carboxylesterase 1, hCES1; human carboxylesterase 2, hCES2; human acetylcholinesterase, hAChE; human butyrylcholineesterase, hBChE; human monoacylglycerol lipase lipases, hMAGL and human alpha/beta-hydrolase domain-containing 6, hABHD6), showing inherent specificities towards hNotum due to their unique "T-shaped" structure. Encouraged by these findings, two Cy7 esters (IR-783 octanoate (ligand 2) and IR-820 octanoate (ligand 4)) were successfully synthesized as potential substrates for hNotum, while their structures were fully characterized (Figs. S9–S23 in Supporting information).
It has been reported that the corresponding Cy7 ketones would be released from Cy7 esters after ester bonds breaking [40-51]. Accordingly, the absorption and emission spectra of the hydrolytic product of either IR-783 octanoate or IR-820 octanoate (namely IR-783 ketone and IR-820 ketone) were measured. As shown in Figs. S4a–d (Supporting information), the maximum excitation/emission wavelengths of IR-783 ketone and IR-820 ketone were determined as 564 nm/646 nm and 590 nm/674 nm, respectively. The maximum emission wavelengths of both Cy7 ketones were much longer than two previously reported hNotum optical substrates (OL and MOF) [28] and near the first biological transparency window. Upon addition of hNotum, dramatic increases of fluorescence intensities were observed at the maximum excitation/emission wavelengths of the corresponding ketone products for both IR-783 octanoate and IR-820 octanoate, confirming that hNotum catalyzed the formation of the corresponding ketone products from Cy7 esters. It was also evident from Figs. S4b, d and e (Supporting information) that compared to IR-820 octanoate, IR-783 octanoate triggered much greater fluorescence enhancement under same conditions, suggesting that IR-783 octanoate was a rapid response optical substrate for hNotum.
Considering that IR-783 ketone undergoes a pH-sensitive conversion between enol form and ketone form, it is important to investigate the changes in excitation/emission wavelengths at different pH values [38]. As shown in Fig. S4f (Supporting information), the fluorescent intensity of IR-783 octanoate was very weak at various pH values, suggesting that this ester was chemical stably over a wide range of pH. By contrast, IR-783 ketone emitted brightly fluorescence signals when pH over 7.0, suggesting that this agent could work well under physiological conditions. These findings suggested that IR-783 octanoate was a rapid response substrate for hNotum and this agent could work well under physiological conditions.
Upon addition of hNotum, IR-783 octanoate could be readily hydrolyzed to release IR-783 ketone, which created brightly signals around 646 nm (Fig. 3a). The specificity of IR-783 octanoate towards hNotum was further examined using a suite of human hydrolases. As shown in Fig. 3b, only hNotum could trigger significant fluorescence enhancement under physiological conditions. In sharp contrast, multiple human esterases and other human proteins with hydrolytic activity hardly trigger fluorescence enhancement around 646 nm. These results clearly demonstrated that IR-783 octanoate was a highly specific fluorogenic substrate for hNotum, suggesting that the "T-shaped" molecule design strategy was well-suited for developing the highly specific fluorogenic substrates for this target serine hydrolase. IR-783 octanoate hydrolysis in hNotum presented canonical Michaelis-Menten kinetics, with the Michaelis-Menten constant (Km) of 0.98 ± 0.10 µmol/L and the maximal reaction velocity (Vmax) value of 8.11 ± 0.21 µmol min−1 µg protein−1 (Fig. 3c). These findings suggested that IR-783 octanoate was a specific substrate for hNotum with high binding-affinity.
As shown in Fig. 3d, the fluorescent signals around 646 nm exhibited a strong correlation with increasing concentrations of hNotum, enabling the determination of hNotum activity in different samples with a robust linear response. These finding clearly demonstrated that IR-783 octanoate was an ideal enzyme-activable optical substrate for hNotum, showing high binding-affinity and excellent enzyme specificity. These favorable characteristics motivated us to utilize it for in-situ functional imaging of hNotum in living systems.
Next, three different types of tumor cells (including Caco-2, OE19 and SW620 cells) were used for imaging the cellular hNotum at the subcellular level, by utilizing IR-783 octanoate as a fluorogenic tool. As shown in Fig. 4a, relatively weak red fluorescence signals were observed in Caco-2 cells, while the red signals predominantly localized at the edges of cell clusters. In sharp contrast, upon addition of IR-783 octanoate, the red fluorescence signals in OE19 and SW620 cells were observed in both cell membrane and cytoplasm. Among three tested cells, the fluorescent intensities inside from SW620 cells was much higher than that in OE19 and Caco-2 cells. It is well-known that Caco-2 cells (derived from primary colorectal adenocarcinoma) display significant epithelial cell differentiation characteristics, while SW620 cells (derived from lymphatic node metastasis of human colorectal adenocarcinoma) exhibit a higher metastatic potential compared to Caco-2 cells [52]. The different hNotum activity in these cell lines determined by IR-783 octanoate also implied that hNotum was closely associated with the progression of colorectal cancers [5,17,21-24]. Notably, the red fluorescence signals could be significantly diminished by LP-9220556 (a potent and selective hNotum inhibitor), confirming that the formation of fluorescent product from IR-783 octanoate was primarily mediated by hNotum in these cancer cells. Meanwhile, it was also noteworthy that the differences in fluorescence intensities of IR-783 octanoate stained cell lines were highly consistent with the hNotum expression levels (Fig. S6 in Supporting information), which were reported in our previous studies [28,29].
Interestingly, some extremely bright cells were observed in IR-783 octanoate stained SW620 cells (Fig. 4a). The brightly fluorescent signals generated in these cells suggested significantly elevated hNotum activity, which would infer the aberrant Wnt signaling pathway in these cells [1-3,5]. Hoechst staining of these cells showed unique feature of multipolar spindles [53-55], while the presence of multipolar spindles is often associated with supernumerary centrosomes (i.e., centrosome amplification (CA)) and chromosomal instability [54,56]. Increasing studies have confirmed that CA is an early event widely present in precancerous lesions of cancers [54,57], which is closely related to Wnt signaling pathway. Considering that the aberrant Wnt signaling pathway may cause CA [57-60], the occurrence of multipolar spindles in these cells was probably associated with the CA triggered by the aberrant Wnt signaling. These observations suggested that IR-783 octanoate could be used as practical fluorogenic tool for visualizing the cells undergoing abnormal cell mitoses or accompanying with dysregulated Wnt signaling pathway, at the single-cell level.
Next, the transmembrane transport mechanism of IR-783 octanoate was investigated. Under physiological conditions, IR-783 octanoate is a charged molecule with a large molecular weight, it may hardly to penetrate the cell membrane simply by diffusion. Previous studies have reported that various Cy7 dyes are transported into living cells mainly via organic anion transporting polypeptides (OATPs), which are widely distributed in tumor cells and regulated by the cancer-related hypoxic-inducing factor-1α (HIF-1α) [61-63]. To confirm the transmembrane transport mechanism of IR-783 octanoate, sulfobromophthalein sodium (BSP, a specific OATPs inhibitor) was used in living SW620 cells. As shown in Fig. S7 (Supporting information), the fluorescence intensities inside from the cells could be significantly reduced upon addition of BSP, confirming that IR-783 octanoate was a good substrate for OATPs and the uptake of this agent into cells was mainly mediated by OATPs. Considering that OATPs is over-expressed in a variety of tumor cells and some solid tumors, which may strongly facilitate the uptake of IR-783 octanoate into cancerous cells and solid tumors.
To further investigate the uptake and imaging performance of IR-783 octanoate in solid tumors, SW620 cells-derived xenografts (CDX) model was established in mice and then imaged using IR-783 octanoate at the organelle level. As shown in Fig. 4b and Fig. S8 (Supporting information), brightly fluorescent signals were observed exclusively in the SW620-derived tumor, persisting for 72 h, while the signals could be significantly attenuated by LP-922056. These observations suggested that IR-783 octanoate showed favorable tumor permeability, outstanding photophysical properties and excellent selectivity towards hNotum at the organelle level, which encouraged us to perform in-situ functional imaging of hNotum in human cancerous tissues by using this novel imaging tool.
Finally, the hNotum activity in human endometrial carcinoma tissues are visualized using IR-783 octanoate as a fluorogenic tool. Previously studies have reported aberrant Wnt signaling in endometrial carcinoma [64-66], while genomics data also suggest high expression levels of hNotum in endometrial carcinoma [67-69]. As shown in Fig. 4c, upon addition of IR-783 octanoate in human endometrial carcinoma tissue slices for 30 min, brightly red fluorescence signals were observed, with an average enhancement of 190-fold. Upon addition of LP-922056, the red fluorescence signals were significantly decreased, suggesting that the red fluorescence signals were triggered mainly by hNotum in these cancerous tissues. These observations suggested that IR-783 octanoate could serve as a practical fluorogenic tool for hNotum-associated clinical carcinoma diagnosis and pathological investigations.
In summary, a suite of "T-shaped" Cy7 esters were rationally designed and synthesized aiming to get a novel and highly specific fluorogenic substrate for hNotum, on the basis of hNotum structure and its substrate preference. Following docking-based screening and experimental validation, IR-783 octanoate was validated as a novel enzyme-activatable fluorogenic tool, owing to this agent showed high affinity (0.98 ± 0.10 µmol/L) and excellent specificity towards hNotum. Under physiological conditions, IR-783 octanoate could be readily hydrolyzed to release a fluorogenic product (IR-783 ketone), which emitted long-wavelength emission around 646 nm. IR-783 octanoate was successfully used for in-situ functional imaging of hNotum in living cells and tumors, with high resolution and good tumor permeability. With the help of this novel fluorogenic tool, the functional heterogeneity of hNotum in different tumor cells were observed at the subcellular level, while a very high hNotum activity level was captured in SW620 cells with multipolar spindles. Collectively, this study devised a practical and highly specific visualization tool for in-situ functional imaging of hNotum in living systems, which would greatly facilitate in-situ monitoring the changes in hNotum activity under various conditions or tracking hNotum-related cellular events at the single-cell level.
Ethical approval
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BALB/c (female, 6-weeks old) nude mice were acquired from the Shanghai University of Traditional Chinese Medicine and approved for use in the study by Shanghai University of Traditional Chinese Medicine Animal Care and Ethics Committee (Approval No. PZSHUTCM2304250007). All animal housing and experiments were conducted in strict accordance with the institutional guidelines for care and use of laboratory animals. Human cancer specimens from endometrial carcinoma were acquired from Liaoning Cancer Hospital & Institute, relative experimental procedures have been approved by the Ethics Committee of Liaoning Cancer Hospital & Institute (Ethical Approval No. 20220244), the study was performed in accordance with the 1964 declaration of HELSINKI and later amendments, written informed consent was obtained from all the participants prior to the enrollment of this study.
Declaration of competing interest
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The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgments
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This study was supported by National Natural Science Foundation of China (Nos. 81922070, 81973286, 82273897, U23A20516, 81801818), Shanghai Municipal Health Commission’s TCM research project (No. 2022CX005), Innovation Team and Talents Cultivation Program of National Administration of Traditional Chinese Medicine (No. ZYYCXTDD-202004), Three-year Action Plan for Shanghai TCM Development and Inheritance Program (No. ZY(2021-2023)-0401), Department of Science & Technology of Liaoning Province Grant (No. 2022JH2/20200056), and supported by the State Key Laboratory of Fine Chemicals, Dalian University of Technology (No. KF 2202).
Supplementary materials
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Supplementary material associated with this article can be found, in the online version, at doi:10.1016/j.cclet.2024.109601.
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doi: 10.1016/j.cclet.2024.109601
  • Receive Date：2023-10-24
  • Online Date：2025-11-26
  • Published：2024-11-15
Article Data
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History
  • Received：2023-10-24
  • Revised：2024-01-29
  • Accepted：2024-01-30
Affiliations
    a Liaoning Provincial Key Laboratory of Carbohydrates, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
    b Shanghai Frontiers Science Center of TCM Chemical Biology, Institute of Interdisciplinary Integrative Medicine Re-search, Shanghai University of Traditional Chinese Medicine, Shanghai 201203, China
    c University of Chinese Academy of Sciences, Beijing 100049, China
    d Health Sciences Institute, China Medical University, Shenyang 110122, China
    e Department of Gynecology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital & Institute, Shenyang 110042, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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