Sequence-specific 1H NMR assignments and secondary structure of the streptococcal pro
 

Sequence-specific 1H NMR assignments and secondary structure of the streptococcal protein G B2-domain.

Related Articles Sequence-specific 1H NMR assignments and secondary structure of the streptococcal protein G B2-domain.

Biochemistry. 1992 Apr 14;31(14):3604-11

Authors: Orban J, Alexander P, Bryan P

Two-dimensional NMR spectroscopy has been used to obtain sequence-specific 1H NMR assignments for the IgG-binding B2-domain of streptococcal protein G. Secondary structure elements were identified from analysis of characteristic backbone-backbone NOE patterns and amide proton exchange data. The B2-domain contains a four-stranded beta-sheet region in which the two inner strands form a parallel beta-sheet with each other and antiparallel beta-sheets with the outer strands. The outer strands are connected via a 16-residue alpha-helix and short loops on both ends of the helix. The alpha-helix and beta-sheet structures contain well-defined polar and apolar sides, and numerous long-range NOEs from the apolar helix to apolar sheet regions were used to derive a model for the global fold of the B2-domain. While the overall fold is similar to that obtained for B1-type domains, differences in amide proton exchange rates and hydrophobic packing are observed.

PMID: 1314644 [PubMed - indexed for MEDLINE]



Source: PubMed