RCSB PDB - 1GB1: A NOVEL, HIGHLY STABLE FOLD OF THE IMMUNOGLOBULIN BINDING DOMAIN OF STREPTOCOCCAL PROTEIN G (original) (raw)
A novel, highly stable fold of the immunoglobulin binding domain of streptococcal protein G.
[Gronenborn, A.M.](/search?q=citation.rcsb%5Fauthors:Gronenborn, A.M.), [Filpula, D.R.](/search?q=citation.rcsb%5Fauthors:Filpula, D.R.), [Essig, N.Z.](/search?q=citation.rcsb%5Fauthors:Essig, N.Z.), [Achari, A.](/search?q=citation.rcsb%5Fauthors:Achari, A.), [Whitlow, M.](/search?q=citation.rcsb%5Fauthors:Whitlow, M.), [Wingfield, P.T.](/search?q=citation.rcsb%5Fauthors:Wingfield, P.T.), [Clore, G.M.](/search?q=citation.rcsb%5Fauthors:Clore, G.M.)
(1991) Science 253: 657-661
PubMed: 1871600 Search on PubMed
PubMed Abstract:
The high-resolution three-dimensional structure of a single immunoglobulin binding domain (B1, which comprises 56 residues including the NH2-terminal Met) of protein G from group G Streptococcus has been determined in solution by nuclear magnetic resonance spectroscopy on the basis of 1058 experimental restraints. The average atomic root-mean-square distribution about the mean coordinate positions is 0.27 angstrom (A) for the backbone atoms, 0.65 A for all atoms, and 0.39 A for atoms excluding disordered surface side chains. The structure has no disulfide bridges and is composed of a four-stranded beta sheet, on top of which lies a long helix. The central two strands (beta 1 and beta 4), comprising the NH2- and COOH-termini, are parallel, and the outer two strands (beta 2 and beta 3) are connected by the helix in a +3x crossover. This novel topology (-1, +3x, -1), coupled with an extensive hydrogen-bonding network and a tightly packed and buried hydrophobic core, is probably responsible for the extreme thermal stability of this small domain (reversible melting at 87 degrees C).
Organizational Affiliation:
Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892.