3nfd | pdb_00003nfd

Chronobacterium ammoniagenes ACPS-CoA complex

spinqualitylabelsall models 3nfd, resolution 1.89Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3nfd is a 6 chain structure with sequence from Corynebacterium ammoniagenes. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.89Å Ligands: COA, MSE Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function O31302_CORAM Transfers the 4'-phosphopantetheine moiety from coenzyme A to a Ser of acyl-carrier-protein.[HAMAP-Rule:MF_00101][SAAS:SAAS00089007] Publication Abstract from PubMed The crystal structures of acyl carrier protein synthase (AcpS) from Mycobacterium tuberculosis (Mtb) and Corynebacterium ammoniagenes determined at pH 5.3 and pH 6.5, respectively, are reported. Comparison of the Mtb apo-AcpS structure with the recently reported structure of the Mtb AcpS-ADP complex revealed that AcpS adopts two different conformations: the orthorhombic and trigonal space-group structures show structural differences in the alpha2 helix and in the conformation of the alpha3-alpha4 connecting loop, which is in a closed conformation. The apo-AcpS structure shows electron density for the entire model and was obtained at lower pH values (4.4-6.0). In contrast, at a higher pH value (6.5) AcpS undergoes significant conformational changes, resulting in disordered regions that show no electron density in the AcpS model. The solved structures also reveal that C. ammoniagenes AcpS undergoes structural rearrangement in two regions, similar to the recently reported Mtb AcpS-ADP complex structure. In vitro reconstitution experiments show that AcpS has a higher post-translational modification activity between pH 4.4 and 6.0 than at pH values above 6.5, where the activity drops owing to the change in conformation. The results show that apo-AcpS and AcpS-ADP adopt different conformations depending upon the pH conditions of the crystallization solution. Mycobacterium tuberculosis acyl carrier protein synthase adopts two different pH-dependent structural conformations.,Gokulan K, Aggarwal A, Shipman L, Besra GS, Sacchettini JC Acta Crystallogr D Biol Crystallogr. 2011 Jul;67(Pt 7):657-69. doi:, 10.1107/S0907444911020221. Epub 2011 Jun 11. PMID:21697604 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Acyl carrier protein synthase 3D structures

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