1bdd
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STAPHYLOCOCCUS AUREUS PROTEIN A, IMMUNOGLOBULIN-BINDING B DOMAIN, NMR, MINIMIZED AVERAGE STRUCTURE
OverviewOverview
The three-dimensional solution structure of the recombinant B domain (FB), of staphylococcal protein A, which specifically binds to the Fc portion of, immunoglobulin G, was determined by NMR spectroscopy and hybrid distance, geometry-dynamical simulated annealing calculations. On the basis of 692, experimental constraints including 587 distance constraints obtained from, the nuclear Overhauser effect (NOE), 57 torsion angle (phi, chi 1), constraints, and 48 constraints associated with 24 hydrogen bonds, a total, of 10 converged structures of FB were obtained. The atomic root mean, square difference among the 10 converged structures is 0.52 +/- 0.10 A for, the backbone atoms and 0.98 +/- 0.08 A for all heavy atoms (excluding the, N-terminal segment from Thr1 to Glu9 and the C-terminal segment from Gln56, to Ala60, which are partially disordered). FB is composed of a bundle of, three alpha-helices, i.e., helix I (Gln10-His19), helix II (Glu25-Asp37), and helix III (Ser42-Ala55). Helix II and helix III are antiparallel to, each other, whereas the long axis of helix I is tilted at an angle of, about 30 degrees with respect to those of helix II and helix III. Most of, the hydrophobic residues of FB are buried in the interior of the bundle of, the three helices. It is suggested that the buried hydrophobic residues, form a hydrophobic core, contributing to the stability of FB.(ABSTRACT, TRUNCATED AT 250 WORDS)
About this StructureAbout this Structure
1BDD is a Single protein structure of sequence from Staphylococcus aureus. Full crystallographic information is available from OCA.
ReferenceReference
Three-dimensional solution structure of the B domain of staphylococcal protein A: comparisons of the solution and crystal structures., Gouda H, Torigoe H, Saito A, Sato M, Arata Y, Shimada I, Biochemistry. 1992 Oct 13;31(40):9665-72. PMID:1390743
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