5njb

E. coli Microcin-processing metalloprotease TldD/E with actinonin bound

spinqualitylabelsall models 5njb, resolution 1.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5njb is a 4 chain structure with sequence from Escherichia coli K-12. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.5Å Ligands: BB2, EDO, MES, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TLDD_ECOLI Metalloprotease involved in CcdA degradation. Suppresses the inhibitory activity of the carbon storage regulator (CsrA). Publication Abstract from PubMed TldD and TldE proteins are involved in the biosynthesis of microcin B17 (MccB17), an Escherichia coli thiazole/oxazole-modified peptide toxin targeting DNA gyrase. Using a combination of biochemical and crystallographic methods we show that E. coli TldD and TldE interact to form a heterodimeric metalloprotease. TldD/E cleaves the N-terminal leader sequence from the modified MccB17 precursor peptide, to yield mature antibiotic, while it has no effect on the unmodified peptide. Both proteins are essential for the activity; however, only the TldD subunit forms a novel metal-containing active site within the hollow core of the heterodimer. Peptide substrates are bound in a sequence-independent manner through beta sheet interactions with TldD and are likely cleaved via a thermolysin-type mechanism. We suggest that TldD/E acts as a "molecular pencil sharpener": unfolded polypeptides are fed through a narrow channel into the active site and processively truncated through the cleavage of short peptides from the N-terminal end. The Origins of Specificity in the Microcin-Processing Protease TldD/E.,Ghilarov D, Serebryakova M, Stevenson CEM, Hearnshaw SJ, Volkov D, Maxwell A, Lawson DM, Severinov K Structure. 2017 Sep 11. pii: S0969-2126(17)30259-9. doi:, 10.1016/j.str.2017.08.006. PMID:28943336 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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