4h2k

Crystal structure of the catalytic domain of succinyl-diaminopimelate desuccinylase from Haemophilus influenzaeCrystal structure of the catalytic domain of succinyl-diaminopimelate desuccinylase from Haemophilus influenzae

Structural highlights 4h2k is a 2 chain structure with sequence from Haemophilus influenzae Rd KW20. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.84Å Ligands: Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DAPE_HAEIN Catalyzes the hydrolysis of N-succinyl-L,L-diaminopimelic acid (SDAP), forming succinate and LL-2,6-diaminoheptanedioate (DAP), an intermediate involved in the bacterial biosynthesis of lysine and meso-diaminopimelic acid, an essential component of bacterial cell walls. It can only hydrolyze L,L-N-succinyl-diaminopimelic acid (L,L-SDAP) and is inactive toward D,L-, L,D-, and D,D-SDAP. Publication Abstract from PubMed The emergence of antibiotic-resistant bacterial strains underscores the importance of identifying new drug targets and developing new antimicrobial compounds. Lysine and meso-diaminopimelic acid are essential for protein production and bacterial peptidoglycan cell wall remodeling and are synthesized in bacteria by enzymes encoded within dap operon. Therefore dap enzymes may serve as excellent targets for developing a new class of antimicrobial agents. The dapE-encoded N-succinyl-L,L-diaminopimelic acid desuccinylase (DapE) converts N-succinyl-L,L-diaminopimelic acid to L,L-diaminopimelic acid and succinate. The enzyme is composed of catalytic and dimerization domains, and belongs to the M20 peptidase family. To understand the specific role of each domain of the enzyme we engineered dimerization domain deletion mutants of DapEs from Haemophilus influenzae and Vibrio cholerae, and characterized these proteins structurally and biochemically. No activity was observed for all deletion mutants. Structural comparisons of wild-type, inactive monomeric DapE enzymes with other M20 peptidases suggest that the dimerization domain is essential for DapE enzymatic activity. Structural analysis and molecular dynamics simulations indicate that removal of the dimerization domain increased the flexibility of a conserved active site loop that may provide critical interactions with the substrate. The dimerization domain in DapE enzymes is required for catalysis.,Nocek B, Starus A, Makowska-Grzyska M, Gutierrez B, Sanchez S, Jedrzejczak R, Mack JC, Olsen KW, Joachimiak A, Holz RC PLoS One. 2014 May 7;9(5):e93593. doi: 10.1371/journal.pone.0093593. eCollection , 2014. PMID:24806882 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

spinqualitylabelsall models 4h2k, resolution 1.84Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image