Article(id=1226554099064291497, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1226554095926952065, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20250014, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1736092800000, receivedDateStr=2025-01-06, revisedDate=null, revisedDateStr=null, acceptedDate=1741017600000, acceptedDateStr=2025-03-04, onlineDate=1770362885489, onlineDateStr=2026-02-06, pubDate=1751558400000, pubDateStr=2025-07-04, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1770362885489, onlineIssueDateStr=2026-02-06, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1770362885489, creator=13701087609, updateTime=1770362885489, updator=13701087609, issue=Issue{id=1226554095926952065, tenantId=1146029695717560320, journalId=1192105938417971205, year='2025', volume='65', issue='7', pageStart='2771', pageEnd='3233', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1770362884741, creator=13701087609, updateTime=1770363575040, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1226556991309529548, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1226554095926952065, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1226556991309529549, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1226554095926952065, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=3126, endPage=3135, ext={EN=ArticleExt(id=1226554099391447218, articleId=1226554099064291497, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=Discovery and characterization of a new enzyme for hydrolyzing polyethylene terephthalate (PET), columnId=1192149543992045670, journalTitle=Acta Microbiologica Sinica, columnName=Research Article, runingTitle=null, highlight=null, articleAbstract=

[Objective] The enzymatic depolymerization of polyethylene terephthalate (PET) involves the hydrolysis of PET catalyzed by PET hydrolases, leading to the production of terephthalic acid and ethylene glycol. In this study, we identified a new PET hydrolase through gene mining, with the goal of providing enzymes for efficient depolymerization of waste PET. [Methods] A previously uncharacterized functional enzyme, named as AePETase, was identified through gene mining. This enzyme demonstrated the ability to hydrolyze amorphous PET films. Subsequently, heterologous expression, purification, and enzymatic characterization were performed for AePETase. [Results] AePETase showed a Tm value of (53.0±0.7) ℃, and an optimal reaction temperature of 45 ℃. The optimal buffer was Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0), and the optimal enzyme concentration was 1 µmol/L. After 72 h, the hydrolysis of amorphous PET films by AePETase resulted in 13.4-fold more products than that by the reported IsPETase. [Conclusion] AePETase demonstrates significant hydrolytic activity on PET and represents a promising new enzyme for hydrolyzing PET.

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*E-mail:
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【目的】 聚对苯二甲酸乙二醇酯(polyethylene terephthalate, PET)的生物酶法解聚是通过PET水解酶催化PET水解,得到终产物对苯二甲酸和乙二醇。通过基因挖掘获得新的PET水解酶,可为废弃PET的生物酶法解聚提供可用于分子改造的蛋白。 【方法】 通过基因挖掘的方法发现来源于Alkalilimnicola ehrlichii的未知功能蛋白(命名为AePETase)具有水解无定形PET膜的活性,并对AePETase进行异源表达、纯化和酶学性质研究。 【结果】 确定了AePETase的Tm值为(53.0±0.7) ℃,最适反应温度为45 ℃,最适缓冲液体系为Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0),较合适的酶浓度为1.0 µmol/L以内。在45 ℃条件下,无定形PET膜的水解产物量为已报道的IsPETase的13.4倍(72 h)。 【结论】 AePETase对PET具有较好的水解活性,是一种具有较大潜力的PET水解新酶。

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作者贡献声明

赵伟:PET水解酶的挖掘、性能测试及文章撰写;毕海珍:PET水解酶的克隆表达;Yew Maxine:PET水解酶的活性测试;翟欢欢:部分数据分析及文章修改;张翠英:实验设计及文章修改;朱蕾蕾:整体实验设计及文章修改。

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一种聚对苯二甲酸乙二醇酯(PET)水解新酶的挖掘与酶学性质分析
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赵伟 1, 3 , 毕海珍 2, 3 , Maxine Yew 3 , 翟欢欢 3 , 张翠英 1 , 朱蕾蕾 3
微生物学报 | 研究报告 2025,65(7): 3126-3135
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微生物学报 | 研究报告 2025, 65(7): 3126-3135
一种聚对苯二甲酸乙二醇酯(PET)水解新酶的挖掘与酶学性质分析
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赵伟1, 3, 毕海珍2, 3, Maxine Yew3, 翟欢欢3, 张翠英1, 朱蕾蕾3
作者信息
  • 1.天津科技大学 生物工程学院,天津
  • 2.天津中医药大学 研究生院,天津
  • 3.中国科学院天津工业生物技术研究所,低碳合成工程生物学全国重点实验室,天津
Discovery and characterization of a new enzyme for hydrolyzing polyethylene terephthalate (PET)
Wei ZHAO1, 3, Haizhen BI2, 3, Yew Maxine3, Huanhuan ZHAI3, Cuiying ZHANG1, Leilei ZHU3
Affiliations
  • 1.School of Biological Engineering, Tianjin University of Science & Technology, Tianjin, China
  • 2.Graduate School, Tianjin University of Traditional Chinese Medicine, Tianjin, China
  • 3.State Key Laboratory of Engineering Biology for Low-carbon Manufacturing, Tianjin Institute of Industrial Biotechnology, Chinese Academy of Sciences, Tianjin, China
出版时间: 2025-07-04 doi: 10.13343/j.cnki.wsxb.20250014
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【目的】 聚对苯二甲酸乙二醇酯(polyethylene terephthalate, PET)的生物酶法解聚是通过PET水解酶催化PET水解,得到终产物对苯二甲酸和乙二醇。通过基因挖掘获得新的PET水解酶,可为废弃PET的生物酶法解聚提供可用于分子改造的蛋白。 【方法】 通过基因挖掘的方法发现来源于Alkalilimnicola ehrlichii的未知功能蛋白(命名为AePETase)具有水解无定形PET膜的活性,并对AePETase进行异源表达、纯化和酶学性质研究。 【结果】 确定了AePETase的Tm值为(53.0±0.7) ℃,最适反应温度为45 ℃,最适缓冲液体系为Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0),较合适的酶浓度为1.0 µmol/L以内。在45 ℃条件下,无定形PET膜的水解产物量为已报道的IsPETase的13.4倍(72 h)。 【结论】 AePETase对PET具有较好的水解活性,是一种具有较大潜力的PET水解新酶。

PET水解酶  /  基因挖掘  /  AePETase

[Objective] The enzymatic depolymerization of polyethylene terephthalate (PET) involves the hydrolysis of PET catalyzed by PET hydrolases, leading to the production of terephthalic acid and ethylene glycol. In this study, we identified a new PET hydrolase through gene mining, with the goal of providing enzymes for efficient depolymerization of waste PET. [Methods] A previously uncharacterized functional enzyme, named as AePETase, was identified through gene mining. This enzyme demonstrated the ability to hydrolyze amorphous PET films. Subsequently, heterologous expression, purification, and enzymatic characterization were performed for AePETase. [Results] AePETase showed a Tm value of (53.0±0.7) ℃, and an optimal reaction temperature of 45 ℃. The optimal buffer was Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0), and the optimal enzyme concentration was 1 µmol/L. After 72 h, the hydrolysis of amorphous PET films by AePETase resulted in 13.4-fold more products than that by the reported IsPETase. [Conclusion] AePETase demonstrates significant hydrolytic activity on PET and represents a promising new enzyme for hydrolyzing PET.

polyethylene terephthalate (PET) hydrolase  /  gene mining  /  AePETase
赵伟, 毕海珍, Maxine Yew, 翟欢欢, 张翠英, 朱蕾蕾. 一种聚对苯二甲酸乙二醇酯(PET)水解新酶的挖掘与酶学性质分析. 微生物学报, 2025 , 65 (7) : 3126 -3135 . DOI: 10.13343/j.cnki.wsxb.20250014
Wei ZHAO, Haizhen BI, Yew Maxine, Huanhuan ZHAI, Cuiying ZHANG, Leilei ZHU. Discovery and characterization of a new enzyme for hydrolyzing polyethylene terephthalate (PET)[J]. Acta Microbiologica Sinica, 2025 , 65 (7) : 3126 -3135 . DOI: 10.13343/j.cnki.wsxb.20250014
聚对苯二甲酸乙二醇酯(polyethylene terephthalate, PET)是由对苯二甲酸(terephthalic acid, TPA)和乙二醇(ethylene glycol, EG)通过酯键连接而成的一种应用广泛的石油基合成聚合物[1]。由于PET具有低成本、便携性、耐用性和气体阻隔能力等优点,已被广泛应用于饮料瓶、产品包装和纺织等行业[2]
现阶段大部分PET塑料制品为一次性消费品,废弃后主要通过物理、化学和生物法3种方式实现降解与循环利用。物理再生法是将废PET塑料经过清洗、破碎、再加工等方式得到PET纤维或PET瓶等再生产品;化学循环法是将废弃PET材料通过化学法完全或部分降解为单体或低聚物,实现循环利用,主要方法包括水解法、氨解法、醇解法和热降解法等[3-6];生物酶法主要通过酶催化水解将PET降解为对苯二甲酸双羟乙酯[bis(2-hydroxyethyl) terephthalate, BHET]、对苯二甲酸单羟乙酯[mono(2-hydroxyethyl) terephthalate, MHET]、对苯二甲酸和乙二醇等产物。生物酶法反应条件温和且安全环保,降解产物单体能够用于重新合成PET,具有循环经济的应用前景。
近年来,已从微生物中发现多种可降解PET的PET水解酶,如角质酶和PETase等。角质酶是存在于大多数植物病原菌和腐生植物中的胞外丝氨酸酯酶[7],属于α/β-水解酶家族,具有由Ser、His和Asp组成的催化三联体活性位点[8]。目前研究发现多种嗜热性角质酶(如LCC、Cut190、TfCut2、HiC、FSC、PES-H1、TfH等[9-14])能够在高温条件下降解PET塑料。PETase是2016年从以PET为唯一碳源的大阪伊德氏杆菌(Ideonella sakaiensis) 201-F6中鉴定出的常温PET水解酶[15]IsPETase具有典型的α/β-水解酶折叠结构[16],由S160-H237-D206构成的催化三联体以及由Y87和M161构成的氧阴离子穴;当PET通过疏水相互作用与PETase结合时,通过催化三联体进行2次亲核攻击,裂解酯键使产物从活性中心释放[17-18]。与角质酶相比,来源于I. sakaiensis 201-F6的IsPETase能够在30-40 ℃更加特异性地降解PET。
本研究以IsPETase的氨基酸序列作为模板进行BLAST,对中常温PET水解酶进行基因挖掘,并将重组质粒转入大肠杆菌(Escherichia coli) BL21(DE3)中进行异源表达、纯化以及酶学性质研究,以期为废弃PET的生物酶法解聚提供可进一步改造的新酶催化剂。
菌株E. coli BL21(DE3)和质粒pET-22b(+)均由本实验室保存;含有PET水解酶基因的重组质粒pET22b-AmPETase和pET22b-AePETase委托苏州金唯智生物科技有限公司天津分公司合成。
氨苄青霉素(ampicillin, Amp)购自北京兰博利德商贸有限公司;异丙基-β-d-硫代半乳糖苷(isopropyl-β-d-thiogalactoside, IPTG)购自北京索莱宝科技有限公司;无定形PET膜(Goodfellow, 250 µm)购自顾特服(上海)贸易有限公司。
Agilent 1260 Infinity II,安捷伦科技有限公司;酶标仪,Molecular Devices公司;恒温摇床,上海知楚仪器有限公司;高压灭菌锅,上海伯能仪器有限公司。
以来源于I. sakaiensis 201-F6的IsPETase氨基酸序列为模板,使用蛋白聚类分析工具(enzyme similarity tool, EFI)在UniProtKB数据库(https://www.uniprot.org/)中进行BLAST,通过设定alignment score threshold值对BLAST得到的所有序列进行序列相似性比较,进而构建得到序列相似网络图(sequence similarity network, SSN)。使用Cytoscape v.3.10.3软件对序列相似网络图进行可视化,选择IsPETase所在簇中的100条序列,并使用MEGA软件进行多序列比对,去除不合群序列。使用邻接法将剩余序列构建系统发育树,选用步长检验的检验方法,设置检验次数为1 000次。距离模型选择P-distance,部分删除多序列比对中含有空位的列。最终得到的步长检验合并树大多数的节点可信度大于70%,进而通过考虑所属分支、序列相似性、菌属来源等因素选择了2条候选序列进行蛋白表达与活性表征。
将PET水解酶表达载体pET22b-AmPETase和pET22b-AePETase转入E. coli BL21(DE3)中,涂布平板,37 ℃培养12 h长出单克隆菌落。挑取单菌落于20 mL LB培养基中,37 ℃、220 r/min培养12-16 h,以体积分数1%的接种量接种到1 L LB培养基中,37 ℃、220 r/min摇床培养至OD600为0.6-0.8,加入诱导剂IPTG,使其终浓度为0.1 mmol/L,20 ℃继续培养24 h。培养完成后,使用4 ℃、5 000 r/min低温高速离心机离心50 min,收集菌体与上清液粗酶液。使用0.45 µm滤膜将粗酶液过膜处理后,再使用5 kDa滤膜浓缩至原体积的10%。0.22 µm滤膜过膜处理后,使用AKTA纯化仪和5 mL HisTrap HP层析柱纯化蛋白,A液为含300 mmol/L NaCl的50 mmol/L NaH2PO4缓冲液(pH 8.0),B液为含300 mmol/L NaCl和250 mmol/L咪唑的50 mmol/L NaH2PO4缓冲液(pH 8.0)。利用不同浓度咪唑梯度洗脱的方式得到纯化后的蛋白,再使用50 mL HiPrep 26/10脱盐柱将纯化后蛋白置换至Na2HPO4-NaH2PO4缓冲液(100 mmol/L,pH 8.0)中,保存于-80 ℃。
使用荧光热稳定性测定法检测PET水解酶的Tm值。检测方法:将20 µL蛋白混合液(包含0.5 mg/mL纯化后蛋白10 µL,超纯水2.5 µL,蛋白质染液2.5 µL和蛋白质染液缓冲液5 µL)转移到96孔PCR板中,用光学质量密封胶带密封,并在ABI 7500 FAST RT-PCR仪中以1%的加热速率从25 ℃加热到99 ℃。监测升温过程中蛋白质变性的荧光信号变化,Tm值由一阶导数曲线确定。
标准品标准曲线的配制:标准品有对苯二甲酸单羟乙酯[mono(2-hydroxyethyl) terephthalate, MHET]、对苯二甲酸(terephthalic acid, TPA)。分别配制成10 mmol/L母液,并稀释至10-1 000 µmol/L的梯度标准溶液,通过HPLC检测可得到标准品的标准曲线。
HPLC检测条件:EF-C18色谱柱(4.6 mm×250 mm, 5 µm),流动相为Na2HPO4-NaH2PO4 (20 mmol/L, pH 7.0)缓冲液,内含30%-70%乙腈线性梯度液,流速为0.8 mL/min,上样量为10 µL,检测波长为260 nm。
PET水解酶活性的测定:在2 mL Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)缓冲液中,将0.5 µmol/L纯酶与6 mm圆形无定形PET膜(Goodfellow, 8.3 mg)分别在30 ℃和40 ℃条件下反应48 h。加入等体积含有25%乙腈的缓冲液终止反应,对样品进行稀释和过膜处理(0.22 µm滤膜)后,用于高效液相色谱分析。
酶水解活性测定温度设置为30、35、40、45、50 ℃,分别取24 h和72 h样品,终止反应后检测水解产物TPA、MHET含量,HPLC检测方法同1.5节。
酶水解活性测定缓冲液分别设置为Na2HPO4-NaH2PO4 (100 mmol/L, pH 7.0)、Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)、Tris-HCl (50 mmol/L, pH 8.0)、KH2PO4 (100 mmol/L, pH 8.0)、Glycine-NaOH (100 mmol/L, pH 9.0),分别取24 h和72 h样品,终止反应后检测水解产物TPA和MHET的含量,HPLC检测方法同1.5节。
酶水解活性测定的酶浓度设置为0.5、1.0、1.5、2.0、2.5 µmol/L,分别取24 h和72 h样品,终止反应后检测水解产物TPA和MHET的含量,HPLC检测方法同1.5节。
在45 ℃、2 mL Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)缓冲液条件下,分别进行0.5 µmol/L AePETase和IsPETase纯酶与6 mm无定形PET膜的水解反应,分别取24 h和72 h样品,终止反应后检测水解产物量,比较PET水解酶与IsPETase水解产物TPA和MHET的含量,HPLC检测方法同1.5节。
图1A所示,通过Cytoscape v.3.10.3软件对序列相似网络图进行可视化分析,构建得到的序列相似网络中,IsPETase所在的簇为第一条红色簇,与IsPETase所在节点相关联的其他节点中包含的蛋白质序列可能与IsPETase具有相似功能(催化PET水解)。从相关节点包含的蛋白序列中挑选100条序列构建系统发育树。如图1B所示,将系统发育树根据起始节点划分为3部分。考虑到发育树节点的划分与物种蛋白进化及亲缘关系有关,选择与模板序列距离较近的同一节点分支的来源于Alkalilimnicola ehrlichii的假定蛋白和较远的不同节点分支的来源于大白蚁马杜拉放线菌(Actinomadura macrotermitis)的假定蛋白在E. coli BL21(DE3)中表达并验证功能,分别命名为AePETase和AmPETase。AePETase和AmPETase的理论分子量分别为33.0 kDa和30.8 kDa,与IsPETase的序列一致性分别为48%和39%。
对挖掘到的PET水解酶基因进行合成,转入E. coli BL21(DE3)中后,用IPTG进行诱导表达,并通过SDS-PAGE分析AmPETase和AePETase在E. coli BL21(DE3)中的可溶性表达情况。如图2A所示,与pET22b(+)空载相比,候选酶AmPETase在分子量25-35 kDa处有明显条带,大小与理论分子量(30.8 kDa)一致,因此判断AmPETase在E. coli BL21(DE3)中可溶性表达较好。如图2B所示,与pET22b(+)空载相比,候选酶AePETase在分子量25-35 kDa处有明显条带,大小与理论分子量(33.0 kDa)一致,因此判断AePETase在E. coli BL21(DE3)中可溶性表达较好。进一步通过AKTA纯化,获得了纯度较高的AmPETase和AePETase纯酶(图2C),用于后续的酶学性质研究。
通过ABI 7500 FAST RT-PCR仪检测从25 ℃加热到99 ℃过程中蛋白质变性的荧光信号变化,确定一阶导数曲线,计算PET水解酶的平均Tm值。AmPETase的Tm值为(54.6±1.4) ℃,AePETase的Tm值为(53.0±0.7) ℃。因此推断AmPETase和AePETase均为中常温PET水解酶。
分别在30 ℃和40 ℃条件下,在2 mL Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)缓冲液中将0.5 µmol/L纯酶与6 mm圆形无定形PET膜反应48 h。如图3A所示,在30 ℃条件下,AmPETase并未检测到最终产物TPA与MHET,AePETase生成了0.48 µmol/L的TPA与MHET;如图3B所示,在40 ℃条件下,AmPETase并未检测到最终产物TPA和MHET,而AePETase生成了86.72 µmol/L的TPA和MHET。因此推断AmPETase对无定形PET膜无水解活性,而AePETase对无定形PET膜具有较好的水解活性,并选择AePETase进行后续相关酶学性质研究。
在30-50 ℃条件下,进行AePETase与无定形PET膜水解反应,检测了24 h和72 h的TPA与MHET总产量。如图4所示,随着反应温度从30 ℃增加到45 ℃,TPA与MHET总产量不断增加。在30 ℃时,72 h的总产量为1.04 µmol/L,而在45 ℃时,72 h总产量提升至192.67 µmol/L;从45 ℃增加到50 ℃,TPA与MHET总产量开始下降,在50 ℃时,72 h总产量下降为4.72 µmol/L,说明AePETase在45 ℃下对无定形PET膜具有最高的水解活性。
选择总产物量较高的反应温度40 ℃和45 ℃,分别在以下5种缓冲液体系中进行AePETase与无定形PET膜水解反应:Na2HPO4-NaH2PO4 (100 mmol/L, pH 7.0)、Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)、Tris-HCl (50 mmol/L, pH 8.0)、KH2PO4 (100 mmol/L, pH 8.0)、Glycine-NaOH (100 mmol/L, pH 9.0),检测24 h和72 h的TPA与MHET总产量。如图5所示,在 40 ℃时,Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)和KH2PO4 (100 mmol/L, pH 8.0)的72 h总产物量基本相同,分别为152.25 µmol/L和150.68 µmol/L;而在45 ℃时,Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)的72 h总产物量更高,说明AePETase在Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0)缓冲液下对无定形PET膜具有更高的水解活性。在40 ℃和45 ℃条件下,Tris-HCl (50 mmol/L, pH 8.0)和Glycine-NaOH (100 mmol/L, pH 9.0)均未检测到水解产物。
在酶浓度设置为0.5、1.0、1.5、2.0、2.5 µmol/L的条件下,进行AePETase与无定形PET膜水解反应,检测了24 h和72 h的TPA与MHET总产量。如图6所示,随着酶浓度从0.5 µmol/L增加到1.0 µmol/L,24 h产物总量从44.49 µmol/L下降到13.68 µmol/L,但72 h水解产物总量提高至200.84 µmol/L;当酶浓度从1.0 µmol/L增加到2.5 µmol/L时,24 h和72 h水解产物量均出现降低现象。因此推测AePETase较为合适的酶浓度应为1.0 µmol/L以内。
图7所示,AePETase在24 h和72 h的水解产物总量均高于IsPETase。在72 h时,AePETase与IsPETase的水解产物总量分别为192.67 µmol/L和14.39 µmol/L,AePETase的总产物量达到IsPETase的13.4倍。
PET塑料已成为固体垃圾和海洋微塑料污染的重要来源之一,对废弃PET进行有效地降解回收,是解决固体废弃物污染的重要方向。在本研究中,通过基因挖掘手段挑选了2条以IsPETase为模板挖掘到的中常温候选PET水解酶,并在E. coli BL21(DE3)中实现了异源表达与酶学性质研究。研究发现,与IsPETase处于同一分支的AePETase相较于IsPETase对无定形PET膜具有更显著的水解活性,而不同分支的AmPETase虽实现了可溶性表达与纯化,但与无定形PET膜反应时未检测到水解产物。结构分析发现2条候选新酶均具有与IsPETase相似的Ser-His-Asp催化三联体。考虑到无定形PET膜是由TPA和EG构成的长链大分子且具有一定结晶度,而结晶度对PET水解酶的反应速率有较大影响[19],推测AmPETase可能对具有结晶度的长链酯键大分子水解能力较差,因此未检测到产物。
对AePETase的酶学性质检测表明,该酶在40-45 ℃具有较高的水解活性,最适缓冲液体系为Na2HPO4-NaH2PO4 (100 mmol/L, pH 8.0),而Tris-HCl (50 mmol/L, pH 8.0)和Glycine-NaOH (100 mmol/L, pH 9.0)均未检测到水解产物,原因可能是这2种缓冲液体系影响了AePETase的水解活性。在对酶浓度进行优化的过程中发现,AePETase较为合适的酶浓度为1.0 µmol/L以内,高浓度的酶并不会产生更多产物,这种现象与目前大多数PET水解酶相似。在确定最适条件后,对AePETase与已报道的IsPETase进行了水解活性比较,发现AePETase的水解活性远高于IsPETase,是一种具有较高潜力的PET水解新酶。后续可通过分子改造等方法提高AePETase的水解活性和热稳定性。
作者声明不存在任何可能会影响本文所报告工作的已知经济利益或个人关系。
  • 国家重点研发计划(2023YFC3905000)
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2025年第65卷第7期
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doi: 10.13343/j.cnki.wsxb.20250014
  • 接收时间:2025-01-06
  • 首发时间:2026-02-06
  • 出版时间:2025-07-04
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  • 收稿日期:2025-01-06
  • 录用日期:2025-03-04
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National Key Research and Development Program of China(2023YFC3905000)
国家重点研发计划(2023YFC3905000)
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    1.天津科技大学 生物工程学院,天津
    2.天津中医药大学 研究生院,天津
    3.中国科学院天津工业生物技术研究所,低碳合成工程生物学全国重点实验室,天津
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

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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