1PGX

THE 1.66 ANGSTROMS X-RAY STRUCTURE OF THE B2 IMMUNOGLOBULIN-BINDING DOMAIN OF STREPTOCOCCAL PROTEIN G AND COMPARISON TO THE NMR STRUCTURE OF THE B1 DOMAIN

Summary for 1PGX

• Entry DOI: 10.2210/pdb1pgx/pdb
• Descriptor: PROTEIN G (2 entities in total)
• Functional Keywords: immunoglobulin binding protein
• Biological source: Streptococcus
• Cellular location: Secreted, cell wall; Peptidoglycan-anchor (Potential): P06654
• Total number of polymer chains: 1
• Total formula weight: 9015.95

Authors

Whitlow, M.,Achari, A.,Howard, A.J. (deposition date: 1992-04-03, release date: 1992-07-15, Last modification date: 2024-02-14)

Primary citation

Achari, A.,Hale, S.P.,Howard, A.J.,Clore, G.M.,Gronenborn, A.M.,Hardman, K.D.,Whitlow, M.
1.67-A X-ray structure of the B2 immunoglobulin-binding domain of streptococcal protein G and comparison to the NMR structure of the B1 domain.
Biochemistry, 31:10449-10457, 1992

PubMed Abstract: The structure of the B2 immunoglobulin-binding domain of streptococcal protein G has been determined at 1.67-A resolution using a combination of single isomorphous replacement (SIR) phasing and manual fitting of the coordinates of the NMR structure of B1 domain of streptococcal protein G [Gronenborn, A. M., et al. (1991) Science 253, 657-661]. The final R value was 0.191 for data between 8.0 and 1.67 A. The structure described here has 13 residues preceding the 57-residue Ig-binding domain and 13 additional residues following it, for a total of 83 residues. The 57-residue binding domain is well-determined in the structure, having an average B factor of 18.0. Only residues 8-77 could be located in the electron density maps, with the ends of the structure fading into disorder. Like the B1 domain, the B2 domain consists of four beta-strands and a single helix lying diagonally across the beta-sheet, with a -1, +3 chi, -1 topology. This small structure is extensively hydrogen-bonded and has a relatively large hydrophobic core. These structural observations may account for the exceptional stability of protein G. A comparison of the B2 domain X-ray structure and the B1 domain NMR structure showed minor differences in the turn between strands and two and a slight displacement of the helix relative to the sheet. Hydrogen bonds between crystallographically related molecules account for most of these differences.

PubMed: 1420164
DOI: 10.1021/bi00158a006

Experimental method

X-RAY DIFFRACTION (1.66 Å)