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Quantification of bindings of organometallic ruthenium complexes to GST pi by mass spectrometry
Lin, Yu1,2; Huang, Yongdong3; Zheng, Wei1,2; Wu, Kui1,2; Luo, Qun1,2; Zhao, Yao1,2; Xiong, Shaoxiang1,2,4; Wang, Fuyi1,2,4
2015-05-01
Source PublicationJOURNAL OF INORGANIC BIOCHEMISTRY
ISSN0162-0134
Volume146Pages:44-51
AbstractElectrospray ionization mass spectrometry (ESI-MS) has been widely used to identify binding sites of metal complexes to proteins. However, the MS quantification of the metal-protein coordination remains a challenge. We have recently demonstrated by ESI-MS analysis that organometallic ruthenium complexes [(eta(6)-arene)Ru(en)Cl](+) (arene = p-cymene (1), biphenyl (2) or 9,10-dihydrophenanthrene (3); en = ethylenediamine) bound to human glutathione-S-transferase pi (GST pi) at Cys15 and Cys48 within the G-site, and Cys102 and Met92 on the interface of the GST pi dimer, showing inhibitory potency against the enzyme (J. Inorg. Biochem., 128 (2013) 77-84). Herein, we developed a mass spectrometric method to quantify the binding stoichiometry of the three complexes to GST pi. The differences in signal intensities of the heavy-labelled peptides produced by tryptic digestion of the ruthenated GST pi complexes and the respective light-labelled peptides in the tryptic digest of equimolar GST pi were used to calculate the binding stoichiometry at specific residues. The results indicated that the pre-complexation of GST pi with its substrate GSH significantly reduced the bindings of the ruthenium complexes at Met92 and Cys102, but had little impact on the bindings at Cys15 and Cys48. As the inhibitory activities of the ruthenium complexes against GST pi are similar to those against GST pi in complexation with GSH, these results suggest that the inhibition of the ruthenium complexes on GST pi is attributed to the ruthenation at Cys15 and Cys48. The present work provides not only insights into the understanding on the inhibitory mechanism of ruthenium complexes GST pi, but also a general method for quantitative characterization of metal-protein interactions. (C) 2015 Elsevier Inc. All rights reserved.
KeywordMass Spectrometry Quantification Organometallic Ruthenium Complexes Glutathione-s-transferase Binding Stoichiometry
SubtypeArticle
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
DOI10.1016/j.jinorgbio.2015.02.015
Indexed BySCI
Language英语
WOS KeywordARENE ANTICANCER COMPLEX ; MULTIDIMENSIONAL LIQUID-CHROMATOGRAPHY ; GLUTATHIONE TRANSFERASE P1-1 ; STABLE SULFENIC ACID ; CISPLATIN BINDING ; ESCHERICHIA-COLI ; SERUM-PROTEINS ; PLASMA ; IDENTIFICATION ; METALLODRUGS
WOS Research AreaBiochemistry & Molecular Biology ; Chemistry
WOS SubjectBiochemistry & Molecular Biology ; Chemistry, Inorganic & Nuclear
WOS IDWOS:000353252600006
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/16732
Collection生化工程国家重点实验室
Affiliation1.Beijing Natl Lab Mol Sci, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Chem, CAS Key Lab Analyt Chem Living Biosyst, Beijing 100190, Peoples R China
3.Chinese Acad Sci, Inst Proc Engn, Natl Key Lab Biochem Engn, Beijing 100190, Peoples R China
4.Beijing Mass Spectrometry, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Lin, Yu,Huang, Yongdong,Zheng, Wei,et al. Quantification of bindings of organometallic ruthenium complexes to GST pi by mass spectrometry[J]. JOURNAL OF INORGANIC BIOCHEMISTRY,2015,146:44-51.
APA Lin, Yu.,Huang, Yongdong.,Zheng, Wei.,Wu, Kui.,Luo, Qun.,...&Wang, Fuyi.(2015).Quantification of bindings of organometallic ruthenium complexes to GST pi by mass spectrometry.JOURNAL OF INORGANIC BIOCHEMISTRY,146,44-51.
MLA Lin, Yu,et al."Quantification of bindings of organometallic ruthenium complexes to GST pi by mass spectrometry".JOURNAL OF INORGANIC BIOCHEMISTRY 146(2015):44-51.
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