9avi | pdb_00009avi

TolQ inner membrane protein from Acinetobacter baumannii

spinqualitylabelsall models 9avi, resolution 3.02Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9avi is a 5 chain structure with sequence from Acinetobacter baumannii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.02Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function V5VAS0_ACIBA Part of the Tol-Pal system, which plays a role in outer membrane invagination during cell division and is important for maintaining outer membrane integrity.[HAMAP-Rule:MF_02202] Publication Abstract from PubMed Gram-negative bacteria harness the proton motive force (PMF) within their inner membrane (IM) to uphold the integrity of their cell envelope, an indispensable aspect for both division and survival. The IM TolQ-TolR complex is the essential part of the Tol-Pal system, serving as a conduit for PMF energy transfer to the outer membrane. Here we present cryo-EM reconstructions of Acinetobacter baumannii TolQ in apo and TolR- bound forms at atomic resolution. The apo TolQ configuration manifests as a symmetric pentameric pore, featuring a trans-membrane funnel leading towards a cytoplasmic chamber. In contrast, the TolQ-TolR complex assumes a proton non-permeable stance, characterized by the TolQ pentamer's flexure to accommodate the TolR dimer, where two protomers undergo a translation-based relationship. Our structure-guided analysis and simulations support the rotor-stator mechanism of action, wherein the rotation of the TolQ pentamer harmonizes with the TolR protomers' interplay. These findings broaden our mechanistic comprehension of molecular stator units empowering critical functions within the Gram-negative bacterial cell envelope. TEASER: Apo TolQ and TolQ-TolR structures depict structural rearrangements required for cell envelope organization in bacterial cell division. Structural architecture of TolQ-TolR inner membrane protein complex from opportunistic pathogen Acinetobacter baumannii.,Karimullina E, Guo Y, Khan HM, Emde T, Quade B, Leo RD, Otwinowski Z, Tieleman Peter D, Borek D, Savchenko A bioRxiv [Preprint]. 2024 Jun 19:2024.06.19.599759. doi: , 10.1101/2024.06.19.599759. PMID:38948712 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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