NDLI: Probing three-dimensional structure of bovine serum albumin by chemical cross-linking and mass spectrometry

Content Provider	Springer Nature Link
Author	Huang, Bill X. Kim, Hee Yong Dass, Chhabil
Copyright Year	2004
Abstract	Serum albumin is the principal transporter of fatty acids that are otherwise insoluble in circulating plasma. While the crystal structure of human serum albumin (HSA) as well as its binding with fatty acids has been characterized, the three dimensional structure of bovine serum albumin (BSA) has not been determined although both albumins share 76% sequence homology. In this study we used mass spectrometry coupled with chemical cross-linking, to probe the tertiary structure of BSA. BSA was modified with lysine specific cross-linkers, bis(sulfosuccinimidyl) suberate (BS$^{3}$), disuccinimidyl suberate (DSS) or disuccinimidyl glutarate (DSG), digested with trypsin and analyzed by tandem mass spectrometry. With O-18 labeling during the digestion, through-space cross-linked peptides were readily identified in mass spectra by a characteristic 8 Da shift. From the cross-linked peptides identified in this study, we found that 12 pairs of lysine residues were separated within 20 Å, while 5 pairs were spaced between 20 and 24 Å. The spatial distance constraints generated from five K-K pairs in BSA were consistent with the corresponding distance obtained from the crystal structure of HSA, although only six equivalent K-K pairs could be compared. According to our data, the distance between K235 of IIA and K374 of IIB domain in BSA was farther by 7–11 Å than that expected from the crystal structure of HSA, suggesting structural differences between BSA and HSA in this region. The distance constraints obtained for lysine residues using various cross-linkers should be valuable in assisting the determination of the 3-D structure of BSA.
Starting Page	1237
Ending Page	1247
Page Count	11
File Format	PDF
ISSN	10440305
Journal	Journal of The American Society for Mass Spectrometry
Volume Number	15
Issue Number	8
e-ISSN	18791123
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-01
Publisher Institution	The American Society for Mass Spectrometry
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Analytical Chemistry Biotechnology Organic Chemistry Proteomics Bioinformatics
Content Type	Text
Resource Type	Article
Subject	Spectroscopy Structural Biology

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