2fff | pdb_00002fff
Open Form of a Class A Transpeptidase Domain
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Overview
The class A PBP1b from Streptococcus pneumoniae is responsible for, glycosyltransferase and transpeptidase (TP) reactions, forming the, peptidoglycan of the bacterial cell wall. The enzyme has been produced in, a stable, soluble form and undergoes time-dependent proteolysis to leave, an intact TP domain. Crystals of this TP domain were obtained, diffracting, to 2.2 A resolution, and the structure was solved by using molecular, replacement. Analysis of the structure revealed an "open" active site, with important conformational differences to the previously determined, "closed" apoenzyme. The active-site nucleophile, Ser460, is in an, orientation that allows for acylation by beta-lactams. Consistent with the, productive conformation of the conserved active-site catalytic residues, adjacent loops show only minor deviation from those of known acyl-enzyme, structures. These findings are discussed in the context of enzyme, functionality and the possible conformational sampling of PBP1b between, active and inactive states.
About this Structure
2FFF is a Protein complex structure of sequences from Streptococcus pneumoniae with NI as ligand. Full crystallographic information is available from OCA.
Reference
Structural analysis of an "open" form of PBP1B from Streptococcus pneumoniae., Lovering AL, De Castro L, Lim D, Strynadka NC, Protein Sci. 2006 Jul;15(7):1701-9. Epub 2006 Jun 2. PMID:16751607
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