6fvn

DNA polymerase sliding clamp from Mycobacterium tuberculosis with bound P7 peptide

spinqualitylabelsall models 6fvn, resolution 3.14Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6fvn is a 8 chain structure with sequence from Mycobacterium tuberculosis CDC1551 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.142Å Ligands: ACE, ALC Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DPO3B_MYCTU DNA polymerase III is a complex, multichain enzyme responsible for most of the replicative synthesis in bacteria. This DNA polymerase also exhibits 3' to 5' exonuclease activity. The beta chain is required for initiation of replication once it is clamped onto DNA, it slides freely (bidirectional and ATP-independent) along duplex DNA (By similarity). Publication Abstract from PubMed Bacterial sliding clamps control the access of DNA polymerases to the replication fork and are appealing targets for antibacterial drug development. It is therefore essential to decipher the polymerase-clamp binding mode across various bacterial species. Here, two residues of the E. coli clamp binding pocket, (Ec)S346 and (Ec)M362, and their cognate residues in M. tuberculosis and B. subtilis clamps, were mutated. The effects of these mutations on the interaction of a model peptide with these variant clamps were evaluated by thermodynamic, molecular dynamics, X-rays crystallography, and biochemical analyses. (Ec)M362 and corresponding residues in Gram positive clamps occupy a strategic position where a mobile residue is essential for an efficient peptide interaction. (Ec)S346 has a more subtle function that modulates the pocket folding dynamics, while the equivalent residue in B. subtilis is essential for polymerase activity and might therefore be a Gram positive-specific molecular marker. Finally, the peptide binds through an induced-fit process to Gram negative and positive pockets, but the complex stability varies according to a pocket-specific network of interactions. Interaction of a Model Peptide on Gram Negative and Gram Positive Bacterial Sliding Clamps.,Andre C, Martiel I, Wolff P, Landolfo M, Lorber B, Silva da Veiga C, Dejaegere A, Dumas P, Guichard G, Olieric V, Wagner J, Burnouf DY ACS Infect Dis. 2019 Apr 5. doi: 10.1021/acsinfecdis.9b00089. PMID:30912430 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also DNA polymerase 3D structures

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