7b0q

In meso structure of the membrane integral lipoprotein intramolecular transacylase Lit from Bacillus cereus with H85A mutation

spinqualitylabelsall models 7b0q, resolution 2.42Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7b0q is a 1 chain structure with sequence from Bacillus cereus ATCC 14579. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.42Å Ligands: CIT, GOL, OLC, PG5 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q813T3_BACCR Publication Abstract from PubMed Lipoproteins serve diverse functions in the bacterial cell and some are essential for survival. Some lipoproteins are adjuvants eliciting responses from the innate immune system of the host. The growing list of membrane enzymes responsible for lipoprotein synthesis includes the recently discovered lipoprotein intramolecular transacylase, Lit. Lit creates a lipoprotein that is less immunogenic, possibly enabling the bacteria to gain a foothold in the host by stealth. Here, we report the crystal structure of the Lit enzyme from Bacillus cereus and describe its mechanism of action. Lit consists of four transmembrane helices with an extracellular cap. Conserved residues map to the cap-membrane interface. They include two catalytic histidines that function to effect unimolecular transacylation. The reaction involves acyl transfer from the sn-2 position of the glyceryl moiety to the amino group on the N-terminal cysteine of the substrate via an 8-membered ring intermediate. Transacylation takes place in a confined aromatic residue-rich environment that likely evolved to bring distant moieties on the substrate into proximity and proper orientation for catalysis. Structural basis of the membrane intramolecular transacylase reaction responsible for lyso-form lipoprotein synthesis.,Olatunji S, Bowen K, Huang CY, Weichert D, Singh W, Tikhonova IG, Scanlan EM, Olieric V, Caffrey M Nat Commun. 2021 Jul 12;12(1):4254. doi: 10.1038/s41467-021-24475-0. PMID:34253723 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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