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Default Sequential 1H NMR assignments and secondary structure of an IgG-binding domain from p

Sequential 1H NMR assignments and secondary structure of an IgG-binding domain from protein G.

Related Articles Sequential 1H NMR assignments and secondary structure of an IgG-binding domain from protein G.

Biochemistry. 1991 Jun 4;30(22):5335-40

Authors: Lian LY, Yang JC, Derrick JP, Sutcliffe MJ, Roberts GC, Murphy JP, Goward CR, Atkinson T

Protein G is a member of a class of cell surface bacterial proteins from Streptococcus that bind IgG with high affinity. A fragment of molecular mass 6988, which retains IgG-binding activity, has been generated by proteolytic digestion and analyzed by 1H NMR. Two-dimensional DQF-COSY, TOCSY, and NOESY spectra have been employed to assign the 1H NMR spectrum of the peptide. Elements of regular secondary structure have been identified by using nuclear Overhauser enhancement, coupling constant, and amide proton exchange data. The secondary structure consists of a central alpha-helix (Ala28-Val44), flanked by two portions of beta-sheet (Val5-Val26 and Asp45-Lys62). This is a fundamentally different arrangement of secondary structure from that of protein A, which is made up of three consecutive alpha-helices in free solution (Torigoe et al., 1990). We conclude that the molecular mechanisms underlying the association of protein A and protein G with IgG are different.

PMID: 2036401 [PubMed - indexed for MEDLINE]



Source: PubMed
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