4rki
From Proteopedia
Crystal structure of sliding beta clamp from Helicobacter pylori
Structural highlights
FunctionDPO3B_HELPY 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 PubMedHelicobacter pylori, a gram-negative and microaerophilic bacterium, is the major cause of chronic gastritis, gastric ulcers and gastric cancer. Owing to its central role, DNA replication machinery has emerged as a prime target for the development of antimicrobial drugs. Here, we report 2A structure of beta-clamp from H. pylori (Hpbeta-clamp), which is one of the critical components of DNA polymerase III. Despite of similarity in the overall fold of eubacterial beta-clamp structures, some distinct features in DNA interacting loops exists that have not been reported previously. The in silico prediction identified the potential binders of beta-clamp such as alpha subunit of DNA pol III and DNA ligase with identification of beta-clamp binding regions in them and validated by SPR studies. Hpbeta-clamp interacts with DNA ligase in micromolar binding affinity. Moreover, we have successfully determined the co-crystal structure of beta-clamp with peptide from DNA ligase (not reported earlier in prokaryotes) revealing the region from ligase that interacts with beta-clamp. Structural insight into beta-Clamp and its interaction with DNA Ligase in Helicobacter pylori.,Pandey P, Tarique KF, Mazumder M, Rehman SA, Kumari N, Gourinath S Sci Rep. 2016 Aug 8;6:31181. doi: 10.1038/srep31181. PMID:27499105[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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