Article(id=1241314569734377964, tenantId=1146029695717560320, journalId=1205117023404326918, issueId=1241314565582025478, articleNumber=null, orderNo=null, doi=10.16155/j.0254-1793.2024-0285, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1714320000000, receivedDateStr=2024-04-29, revisedDate=null, revisedDateStr=null, acceptedDate=null, acceptedDateStr=null, onlineDate=1773882055934, onlineDateStr=2026-03-19, pubDate=1738252800000, pubDateStr=2025-01-31, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773882055934, onlineIssueDateStr=2026-03-19, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773882055934, creator=13701087609, updateTime=1773882055934, updator=13701087609, issue=Issue{id=1241314565582025478, tenantId=1146029695717560320, journalId=1205117023404326918, year='2025', volume='45', issue='1', pageStart='1', pageEnd='180', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773882054943, creator=13701087609, updateTime=1773882204745, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241315193960059168, tenantId=1146029695717560320, journalId=1205117023404326918, issueId=1241314565582025478, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241315193964253473, tenantId=1146029695717560320, journalId=1205117023404326918, issueId=1241314565582025478, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=99, endPage=103, ext={EN=ArticleExt(id=1241314569994424817, articleId=1241314569734377964, tenantId=1146029695717560320, journalId=1205117023404326918, language=EN, title=Study of liquid chromatography-mass spectrometry identification of target protein expression in recombinant CHO cell lines, columnId=1206272756979659107, journalTitle=Chinese Journal of Pharmaceutical Analysis, columnName=Bioassay, runingTitle=null, highlight=null, articleAbstract=
Objective:

To optimize an LC-Q TOF MS method for the determination of target proteins expressed in recombinant cells from a cell bank.

Methods:

The recombinant Chinese hamster ovary (CHO) cell line expressing antibodies was selected. The supernatant of recombinant CHO cell suspensions was retained after 12 500 r·min-1 centrifuging for 10 min and treated with 50 mmol·L-1 NH4HCO3 solution. Chymotrypsin was added for enzymatic digestion, and the comparative analyses were carried out using two LC-Q TOF MS with Advance Bio Peptide(100 mm×2.1 mm, 2.7 μm) column, the Sciex TRIPLE TOF 5600+ and the Agilent Q TOF G6545, respectively. To establish the database, the amino acid sequences of the characteristic peptides of the protein heavy and light chains were entered into SCIEX BioPharmaView Version 3.0 and Agilent MassHunter BioConfirm 12.0 software, respectively. The peptides detected in the samples were searched to identify the target peptides.

Results:

The samples were analysed by a Sciex TRIPLE TOF 5600+ instrument to obtain 8 characteristic peptides with 100%amino acid sequence coverage and the samples were analysed by an Agilent Q TOF G6545 instrument to obtain 12 characteristic peptides with 100% amino acid sequence coverage.

Conclusion:

The method established in this study is simple to operate, has high coverage and good stability, can be used to identify the expression of target proteins in recombinant CHO cell lines. It also provides a reference for the expression identification of target proteins in similar cell lines.

, correspAuthors=Lin PANG, Chun-ming RAO, authorNote=null, correspAuthorsNote=null, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Zhao-fei KANG, Ke-xin WANG, Chun-le HAN, Lin PANG, Chun-ming RAO), CN=ArticleExt(id=1241314570459992573, articleId=1241314569734377964, tenantId=1146029695717560320, journalId=1205117023404326918, language=CN, title=液质联用鉴定重组CHO细胞株目的蛋白的表达研究, columnId=1206272757600416118, journalTitle=药物分析杂志, columnName=生物检定, runingTitle=null, highlight=null, articleAbstract=
目的:

采用高分辨四极杆-飞行时间液质联用(LC-Q TOF MS)技术,探索重组中国仓鼠卵巢(CHO)细胞株目的蛋白的表达鉴定方法。

方法:

选择1株表达抗体的重组CHO细胞株,将该细胞悬液12 500 r·min-1离心10 min,取上清液,使用碳酸氢铵溶液(50 mmol·L-1)置换液体,加入胰凝乳蛋白酶(chymotrypsin)进行酶切,采用Advance Bio Peptide(100 mm×2.1 mm, 2.7 μm)色谱柱,通过Sciex TRIPLE TOF 5600+与Agilent Q TOF G6545 2台液质联用仪进行对比分析。根据保密要求和氨基酸覆盖率选择合适的特征肽段,并将该抗体目的蛋白重链与轻链的特征肽氨基酸序列分别输入SCIEX BioPharmaView Version 3.0与Agilent MassHunter BioConfirm 12.0软件中,建立数据库,对样品中实际检测得到的肽段进行搜库检索,验证并鉴定出目的蛋白特征肽。

结果:

样品通过Sciex TRIPLE TOF 5600+仪器分析得到8条特征肽段,氨基酸覆盖率为100%;样品通过Agilent Q TOF G6545仪器分析得到12条特征肽段,氨基酸覆盖率为100%。

结论:

本研究建立的方法操作简单,覆盖率高,稳定性好,可用于该抗体重组CHO细胞株目的蛋白的表达鉴定,也可为同类细胞株其他蛋白的表达鉴定提供参考。

, correspAuthors=庞琳, 饶春明, authorNote=null, correspAuthorsNote=
* 饶春明 Tel:(010)67869966;E-mail:;
庞琳 Tel:(010)67869966;E-mail:
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康赵飞 Tel:(010)67869966;E-mail:

王可心 Tel:(010)67869966;E-mail:

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Gradient elution conditions of Sciex ExionLC AD UHPLC

, figureFileSmall=null, figureFileBig=null, tableContent=
t/min流动相比例(ratio of mobile phase)/%
流动相(mobile phase)A流动相(mobile phase)B
0.00955
1.00955
40.006040
45.001090
50.001090
50.10955
60.00955
), ArticleFig(id=1241324060467064947, tenantId=1146029695717560320, journalId=1205117023404326918, articleId=1241314569734377964, language=CN, label=表1, caption=

Sciex ExionLC AD UHPLC梯度洗脱条件

, figureFileSmall=null, figureFileBig=null, tableContent=
t/min流动相比例(ratio of mobile phase)/%
流动相(mobile phase)A流动相(mobile phase)B
0.00955
1.00955
40.006040
45.001090
50.001090
50.10955
60.00955
), ArticleFig(id=1241324060555145341, tenantId=1146029695717560320, journalId=1205117023404326918, articleId=1241314569734377964, language=EN, label=Tab. 2, caption=

Target peptides identified by TRIPLE TOF 5600+

, figureFileSmall=null, figureFileBig=null, tableContent=
序号(No.)序列(sequence)序列位置(sequence location)保留时间(retention time)/min m/z偏差(diff) ×10-6打分(score)
1EIKRTVAAPSVFL(9-20)13.721 87659.378 66-1.865 5314.118
2EIKRTVAAPSVFL(9-20)14.093 03659.366 41-20.455 25-
3GGGTKLL(3-8)2.024 1532.309 210.512 158.056
4GGGTKLL(3-8)2.023 27266.659 043.509 26-
5GGGTKLEIL(3-10)25.823 69774.438 864.211 13-
6IFPPSDEQLL(21-29)7.975 18523.276 5124.553 72.747
7SSASTKGPSVFPLH(1-13)18.697 4639.337 34-4.847 812.233
8TFGGGTKLL(1-8)9.789 67780.423 75-1.634 348.47
), ArticleFig(id=1241324060647420035, tenantId=1146029695717560320, journalId=1205117023404326918, articleId=1241314569734377964, language=CN, label=表2, caption=

TRIPLE TOF 5600+鉴定的目标肽段

, figureFileSmall=null, figureFileBig=null, tableContent=
序号(No.)序列(sequence)序列位置(sequence location)保留时间(retention time)/min m/z偏差(diff) ×10-6打分(score)
1EIKRTVAAPSVFL(9-20)13.721 87659.378 66-1.865 5314.118
2EIKRTVAAPSVFL(9-20)14.093 03659.366 41-20.455 25-
3GGGTKLL(3-8)2.024 1532.309 210.512 158.056
4GGGTKLL(3-8)2.023 27266.659 043.509 26-
5GGGTKLEIL(3-10)25.823 69774.438 864.211 13-
6IFPPSDEQLL(21-29)7.975 18523.276 5124.553 72.747
7SSASTKGPSVFPLH(1-13)18.697 4639.337 34-4.847 812.233
8TFGGGTKLL(1-8)9.789 67780.423 75-1.634 348.47
), ArticleFig(id=1241324060722917514, tenantId=1146029695717560320, journalId=1205117023404326918, articleId=1241314569734377964, language=EN, label=Tab. 3, caption=

Gradient elution conditions of infinity 1290 UHPLC

, figureFileSmall=null, figureFileBig=null, tableContent=
t/min流动相比例(ratio of mobile phase)/%
流动相(mobile phase)A流动相(mobile phase)B
0.00955
1.00955
40.006040
45.001090
50.001090
50.10955
60.00955
), ArticleFig(id=1241324060810997904, tenantId=1146029695717560320, journalId=1205117023404326918, articleId=1241314569734377964, language=CN, label=表3, caption=

Infinity 1290 UHPLC梯度洗脱条件

, figureFileSmall=null, figureFileBig=null, tableContent=
t/min流动相比例(ratio of mobile phase)/%
流动相(mobile phase)A流动相(mobile phase)B
0.00955
1.00955
40.006040
45.001090
50.001090
50.10955
60.00955
), ArticleFig(id=1241324062333530263, tenantId=1146029695717560320, journalId=1205117023404326918, articleId=1241314569734377964, language=EN, label=Tab. 4, caption=

Target peptides identified by Q TOF G6545

, figureFileSmall=null, figureFileBig=null, tableContent=
序号(No.)序列(sequence)序列位置(sequence location)保留时间(retention time)/min m/z偏差(diff)×10-6打分(score)
1GGGTKLL(3-8)1.018532.308 5-0.8379.18
2GGGTKLL(3-8)18.040532.308 1-1.5679.03
3TFGGGTKLL(1-8)18.041390.716 1-0.4583.35
4EIKRTVAAPSVFL(9-20)25.216659.379 7-0.1789.47
5VAAPSVFL(14-20)27.947690.381 7-0.5582.50
7TVAAPSVFL(13-20)29.201791.426 9-3.6879.34
8IFPPSDEQLL(21-29)29.674523.263 7-0.5874.62
9VFPLH(10-13)30.898475.291 60.1468.57
10KGPSVFPLH(6-13)31.518422.750 30.1680.85
11SSASTKGPSVFPLH(1-13)31.643639.340 1-0.6286.80
12SASTKGPSVFPLH(2-13)31.742595.824 80.5287.95
), ArticleFig(id=1241324062413222045, tenantId=1146029695717560320, journalId=1205117023404326918, articleId=1241314569734377964, language=CN, label=表4, caption=

Q TOF G6545鉴定的目标肽段

, figureFileSmall=null, figureFileBig=null, tableContent=
序号(No.)序列(sequence)序列位置(sequence location)保留时间(retention time)/min m/z偏差(diff)×10-6打分(score)
1GGGTKLL(3-8)1.018532.308 5-0.8379.18
2GGGTKLL(3-8)18.040532.308 1-1.5679.03
3TFGGGTKLL(1-8)18.041390.716 1-0.4583.35
4EIKRTVAAPSVFL(9-20)25.216659.379 7-0.1789.47
5VAAPSVFL(14-20)27.947690.381 7-0.5582.50
7TVAAPSVFL(13-20)29.201791.426 9-3.6879.34
8IFPPSDEQLL(21-29)29.674523.263 7-0.5874.62
9VFPLH(10-13)30.898475.291 60.1468.57
10KGPSVFPLH(6-13)31.518422.750 30.1680.85
11SSASTKGPSVFPLH(1-13)31.643639.340 1-0.6286.80
12SASTKGPSVFPLH(2-13)31.742595.824 80.5287.95
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液质联用鉴定重组CHO细胞株目的蛋白的表达研究
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康赵飞 , 王可心 , 韩春乐 , 庞琳 * , 饶春明 *
药物分析杂志 | 生物检定 2025,45(1): 99-103
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药物分析杂志 | 生物检定 2025, 45(1): 99-103
液质联用鉴定重组CHO细胞株目的蛋白的表达研究
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康赵飞 , 王可心 , 韩春乐, 庞琳* , 饶春明*
作者信息
  • 北京昭衍药物检定研究有限公司,北京102600
  • 康赵飞 Tel:(010)67869966;E-mail:

    王可心 Tel:(010)67869966;E-mail:

通讯作者:

* 饶春明 Tel:(010)67869966;E-mail:;
庞琳 Tel:(010)67869966;E-mail:
Study of liquid chromatography-mass spectrometry identification of target protein expression in recombinant CHO cell lines
Zhao-fei KANG , Ke-xin WANG , Chun-le HAN, Lin PANG* , Chun-ming RAO*
Affiliations
  • [JOINN Pharmaceutical Quality Research and Testing (Beijing) Co, Ltd, Beijing 102600, China]
出版时间: 2025-01-31 doi: 10.16155/j.0254-1793.2024-0285
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目的:

采用高分辨四极杆-飞行时间液质联用(LC-Q TOF MS)技术,探索重组中国仓鼠卵巢(CHO)细胞株目的蛋白的表达鉴定方法。

方法:

选择1株表达抗体的重组CHO细胞株,将该细胞悬液12 500 r·min-1离心10 min,取上清液,使用碳酸氢铵溶液(50 mmol·L-1)置换液体,加入胰凝乳蛋白酶(chymotrypsin)进行酶切,采用Advance Bio Peptide(100 mm×2.1 mm, 2.7 μm)色谱柱,通过Sciex TRIPLE TOF 5600+与Agilent Q TOF G6545 2台液质联用仪进行对比分析。根据保密要求和氨基酸覆盖率选择合适的特征肽段,并将该抗体目的蛋白重链与轻链的特征肽氨基酸序列分别输入SCIEX BioPharmaView Version 3.0与Agilent MassHunter BioConfirm 12.0软件中,建立数据库,对样品中实际检测得到的肽段进行搜库检索,验证并鉴定出目的蛋白特征肽。

结果:

样品通过Sciex TRIPLE TOF 5600+仪器分析得到8条特征肽段,氨基酸覆盖率为100%;样品通过Agilent Q TOF G6545仪器分析得到12条特征肽段,氨基酸覆盖率为100%。

结论:

本研究建立的方法操作简单,覆盖率高,稳定性好,可用于该抗体重组CHO细胞株目的蛋白的表达鉴定,也可为同类细胞株其他蛋白的表达鉴定提供参考。

重组蛋白  /  液质联用  /  氨基酸序列  /  特征肽鉴定  /  胰凝乳蛋白酶  /  胰蛋白酶
Objective:

To optimize an LC-Q TOF MS method for the determination of target proteins expressed in recombinant cells from a cell bank.

Methods:

The recombinant Chinese hamster ovary (CHO) cell line expressing antibodies was selected. The supernatant of recombinant CHO cell suspensions was retained after 12 500 r·min-1 centrifuging for 10 min and treated with 50 mmol·L-1 NH4HCO3 solution. Chymotrypsin was added for enzymatic digestion, and the comparative analyses were carried out using two LC-Q TOF MS with Advance Bio Peptide(100 mm×2.1 mm, 2.7 μm) column, the Sciex TRIPLE TOF 5600+ and the Agilent Q TOF G6545, respectively. To establish the database, the amino acid sequences of the characteristic peptides of the protein heavy and light chains were entered into SCIEX BioPharmaView Version 3.0 and Agilent MassHunter BioConfirm 12.0 software, respectively. The peptides detected in the samples were searched to identify the target peptides.

Results:

The samples were analysed by a Sciex TRIPLE TOF 5600+ instrument to obtain 8 characteristic peptides with 100%amino acid sequence coverage and the samples were analysed by an Agilent Q TOF G6545 instrument to obtain 12 characteristic peptides with 100% amino acid sequence coverage.

Conclusion:

The method established in this study is simple to operate, has high coverage and good stability, can be used to identify the expression of target proteins in recombinant CHO cell lines. It also provides a reference for the expression identification of target proteins in similar cell lines.

recombinant protein  /  LC-MS  /  amino acid sequences  /  characteristic peptide identification  /  chymotrypsin  /  trypsin
康赵飞, 王可心, 韩春乐, 庞琳, 饶春明. 液质联用鉴定重组CHO细胞株目的蛋白的表达研究. 药物分析杂志, 2025 , 45 (1) : 99 -103 . DOI: 10.16155/j.0254-1793.2024-0285
Zhao-fei KANG, Ke-xin WANG, Chun-le HAN, Lin PANG, Chun-ming RAO. Study of liquid chromatography-mass spectrometry identification of target protein expression in recombinant CHO cell lines[J]. Chinese Journal of Pharmaceutical Analysis, 2025 , 45 (1) : 99 -103 . DOI: 10.16155/j.0254-1793.2024-0285
中国仓鼠卵巢(Chinese hamster ovary,CHO)细胞是哺乳动物细胞表达系统,具有能够稳定表达外源蛋白以及进行蛋白质翻译后的加工修饰,且携带完整的蛋白质糖化修饰系统等优势[1-3],与原核表达系统比较,CHO细胞表达的重组蛋白药物在结构、生物活性等方面与天然蛋白形态相似度高,是生物技术药物生产中的关键起始原材料[4-5]
生产用重组细胞基质进行细胞库检定时常常仅针对细胞基质总的要求进行评价,如细胞鉴别试验、无菌检查、支原体检查、内外源病毒因子检查等,但与重组细胞专属性密切相关的重组目的基因或表达的目的蛋白鉴定往往在细胞株检定中是缺失的[6-7]。2020年版《中华人民共和国药典》三部“生物制品生产检定用动物细胞基质制备及质量控制”通则中明确指出对于重组细胞而言,除细胞鉴别试验外,应对目的蛋白基因或目的蛋白进行检测[8]。然而,《中华人民共和国药典》中并未给出具体试验方法,已有文献对于此项技术的研究也鲜有报道,目前常用的重组蛋白鉴定方法主要包括酶联免疫吸附法、免疫印迹法和质谱分析等,但是否能有效地应用于重组细胞中目的蛋白的表达鉴定还有待进一步方法开发和验证。本文选择1株表达抗体的重组CHO细胞株,采用高分辨四极杆-飞行时间液质联用(LC-Q TOF MS)技术,探索重组CHO细胞株目的蛋白的表达鉴定方法,为重组细胞库的质量控制提供技术支持。
液质联用技术是一种强大的分析技术,其中,液相色谱系统为分离系统,质谱系统为检测系统[9]。在分析样品时,质谱质量分析器将离子碎片按质荷比进行分离,通过检测器得到质谱图[10]。因其精密度高,重复性好,并且在方法开发阶段的高灵活性和多功能性,近年来在生物技术药物领域广泛应用。传统上,质谱分析方法要想获得高序列覆盖率甚至100%覆盖率,需要采取多种办法。例如高度复杂的蛋白混合物应在分析前对目的蛋白进行有效的分离纯化[11],其次使用不同蛋白酶的组合[12],又或者结合基质辅助激光解吸(MALDI)和电喷雾电离源(ESI)的互补使用[13]。上述这些传统的方法开发不利于质谱技术在生物技术药物应用上的推广。因此,本研究旨在建立重组CHO细胞株目的蛋白表达鉴定方法,通过筛选重组蛋白的特异氨基酸序列,探索出适合样本的处理条件,利用液质联用技术进行重组细胞库中目的蛋白的鉴定,序列覆盖率≥95%。并在不同型号液质联用仪进行目的蛋白鉴定的重复,以验证此方法的重现性,从而保证该生产用重组细胞库的质量可控性,满足此类产品的注册和评价需求。
5430R/5910Ri高速冷冻离心机购自Eppendorf公司;Eppendorf ThermoMixer C恒温混匀仪购自Eppendorf公司;TRIPLE TOF 5600+高分辨四极杆-飞行时间质谱仪(Q TOF MS)购自Sciex公司,配有Sciex ExionLC AD UHPLC系统;Q TOF G6545高分辨四极杆-飞行时间质谱仪(Q TOF MS)购自Agilent公司,配有Agilent Infinity 1290 UHPLC系统。
碳酸氢铵购自Thermo公司;RapiGest SF试剂购自Waters公司;二硫苏糖醇、碘乙酰胺、氯化钙购自Sigma-Aldrich公司;测序级胰蛋白酶(trypsin)与胰凝乳蛋白酶(chymotrypsin)购自Promega公司;质谱级甲酸购自Dikma公司;质谱级甲醇、乙腈购自Fisher Chemical公司。
本研究使用的重组CHO细胞悬液为同一批次,由舒泰神公司提供(可公开重链序列:SSASTKGPSVFPL;轻链序列:TFGGGTKLEIKRTVAA PSVFIFPPSDEQL)。
取重组CHO细胞悬液120 μL,12 500 r·min-1离心10 min去除样品中可沉淀异物,取上清液置于超滤管中,12 500 r·min-1离心10 min,弃去滤液。在超滤管中加入碳酸氢铵水溶液(50 mmol·L-1)120 μL,12 500 r·min-1离心10 min,超滤换液重复3次,弃去滤液。将滤芯倒置于新的外管中,12 500 r·min-1离心10 min,取外管中全部液体,用碳酸氢铵水溶液(50 mmol·L-1)定容至100 μL。
在上述液体中加入1% RapiGest SF溶液10 μL,加入二硫苏糖醇溶液(100 mmol·L-1)10 μL,恒温涡旋混匀仪85 ℃孵育25 min,加入碘乙酰胺溶液(200 mmol·L-1)10 μL,室温避光反应至少30 min,按照实验分组分别加入不同种类蛋白酶。本研究选取3种蛋白酶组合:a.加入胰蛋白酶进行酶切;b. 胰凝乳蛋白酶进行酶切;c. 胰蛋白酶与胰凝乳蛋白酶(1 :1)进行酶切。每种酶质量浓度为1 μg·μL-1,加入的体积均为5 μL,并且,b组与c组样品中需要加入氯化钙水溶液(100 mmol·L-1)10 μL,37 ℃酶切3~5 h。然后,加入甲酸10 μL,37 ℃孵育30 min,12 500 r·min-1离心20 min,取上清液,以待后续分析。
采用Advance Bio Peptide(100 mm×2.1 mm, 2.7 μm)色谱柱,自动进样器温度4 ℃,柱温30 ℃,以0.1%甲酸水溶液(A)-含0.1%甲酸乙腈溶液(B)为流动相,流速0.3 mL·min-1,梯度洗脱(表1),以50%甲醇水溶液为洗针液,进样体积10 μL。
离子源为ESI,采用高灵敏度IDA正离子模式,雾化气流速55 L·h-1,辅助气流速55 L·h-1,气帘气流速30 L·h-1,离子源温度500 ℃,喷雾电压5.5 kV,一级质谱扫描范围100~2 000,二级质谱扫描范围50~2 000。
将目的蛋白重链与轻链的特征肽氨基酸序列输入SCIEX BioPharmaView Version 3.0软件中,建立数据库。将样品进行酶切处理后按“2.2.1”项下方法进样检测,得到的肽段进行搜库检索,鉴定出目的蛋白特征肽。分析参数:酶类型为胰凝乳蛋白酶,最大漏切位点5,肽段最大组合修饰数4,m/z容差±0.005%,最小肽链长度3,MS/MS匹配容差0.03。
不同蛋白酶具有不同的酶切位点,因此,会对样品酶切产生的肽段产生影响,进而导致目的蛋白特征肽氨基酸序列鉴定结果覆盖率不一致。本研究中,3种不同酶切方式的覆盖率分别11.9%、100%、64.3%。其中,b组样品一共搜索到8条相关肽段(表2)。接下来,为验证此方法可行性与稳定性,选择胰凝乳蛋白酶,在其他实验条件相同的情况下,使用LC-Q TOF MS进行分析。
采用Advance Bio Peptide(100 mm×2.1 mm, 2.7 μm)色谱柱,自动进样器4 ℃,柱温60 ℃,以0.1%甲酸水溶液(A)-含0.1%甲酸乙腈溶液(B)为流动相,流速0.3 mL·min-1,梯度洗脱(表3),以50%甲醇水溶液为洗针液,进样体积10 μL。
离子源为ESI,采用Auto MS/MS正离子模式,鞘气流速11 L·min-1,鞘气温度350 ℃,干燥气流速8 L·min-1,干燥气温度320 ℃,喷雾电压1 kV,毛细管电压3.5 kV,一级质谱扫描范围m/z 100~1 700,二级质谱扫描范围m/z 100~1 700。
将目的蛋白重链与轻链的特征肽氨基酸序列输入Agilent MassHunter BioConfirm 12.0软件中,建立数据库。将样品中实际检测得到的肽段进行搜库检索,鉴定出目的蛋白特征肽。分析参数:工作类型为Protein Digest,酶类型为胰凝乳蛋白酶,绝对峰高≥ 50 counts,保留时间范围0~80 min,修饰类型为烷基化(碘乙酰胺),m/z容差30×10-6。经软件搜库鉴定后,样品中目的蛋白覆盖率为100%,共搜索到12条肽段(表4)。
本研究利用LC-Q TOF MS技术,在不进行重组蛋白纯化分离的情况下,根据重组蛋白的一级序列来筛选出更为合适的蛋白酶,引入RapiGest SF表面活性剂,提高了蛋白质酶解的速度和回收率,缩短了酶解反应时间,仅用1 d时间即可完成混合蛋白的样本处理[14-16];为了快速准确鉴定重组CHO细胞悬液目的蛋白的表达,本研究最终选取包含该目的蛋白的轻链及重链可变区与恒定区的一部分作为目标序列,在NCBI(https://www.ncbi.nlm.nih.gov/)上利用blastp工具将选取的序列与Chinese hamster(taxid:10029)蛋白数据库进行了序列比对,比对结果证明选取序列是特异性的,这样可以保证同时兼顾表达的目的蛋白的特异性与方法的稳定性;为了获得高覆盖率,在不增加样本处理过程复杂度的情况下,通过筛选不同的蛋白酶,设想通过使用一种蛋白酶即可达到设定目标,最终仅利用胰凝乳蛋白酶,得到100%的覆盖率。而Yates等[12]用3种不同的酶(胰蛋白酶,Glu-C、Subtilisin)消化从血液中获得的血红蛋白,并用微毛细管液相色谱系统分析3种酶消化的混合肽样本才可获得>99%的序列覆盖率。Prokai等[13]利用ESI-IT-MS和MALDI-TOF 2种质谱检测系统,获得了从海葵中纯化的细胞溶解素蛋白95%以上的序列覆盖率。为了验证本方法的适用性,先后在Sciex TRIPLE TOF 5600+ 与Agilent Q TOF G6545 2套LC-Q TOF MS仪上进行酶解后的重组蛋白表达鉴定,均得到100%的覆盖率。不同的是,Sciex TRIPLE TOF 5600+检测到8条肽段,Agilent Q TOF G6545检测到12条肽段。2种质谱检测到的肽段数目差异主要是因为质谱仪器的灵敏度和分辨率不同造成的。Agilent Q TOF G6545分辨率最高可达到50 000,1 pg利血平柱上进样检测灵敏度可以达到信噪比1 500 :1,而Sciex TRIPLE TOF 5600+的最高分辨率只有40 000。虽然2种质谱鉴定得到的肽段数目不同,但都能够获得100%覆盖率,达到了对重组CHO细胞株目的蛋白表达鉴定的目的。
本文开发的重组细胞株目的蛋白表达鉴定思路是通用的,但需要注意的是,应用于其他重组细胞目的蛋白快速鉴定时,还需重新考虑选择合适的蛋白酶,根据测得的覆盖率结果选择合适的特征肽段,以及数据算法对目的蛋白序列覆盖率的影响等。
综上所述,重组细胞目的蛋白是否表达是药物研发工作者和质量控制部门关心的核心问题,本研究首先在细胞水平上利用DNA指纹条码技术鉴定了该细胞系种属,然后采用液质联用技术对该重组细胞的目的蛋白表达进行了鉴定,得到的目标序列100%与该蛋白特征肽理论序列匹配。该法操作简单,覆盖率高,稳定性好,可用于该制品细胞株目的蛋白的表达鉴定,也可为同类细胞株其他蛋白的表达鉴定提供参考。
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doi: 10.16155/j.0254-1793.2024-0285
  • 接收时间:2024-04-29
  • 首发时间:2026-03-19
  • 出版时间:2025-01-31
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  • 收稿日期:2024-04-29
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    北京昭衍药物检定研究有限公司,北京102600

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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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