9xby | pdb_00009xby

BAM-SurA complex (P1-visible)

spinqualitylabelsall models 9xby, resolution 3.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 9xby is a 6 chain structure with sequence from Escherichia coli. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.9Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function BAMA_ECO24 Part of the outer membrane protein assembly complex, which is involved in assembly and insertion of beta-barrel proteins into the outer membrane. Constitutes, with BamD, the core component of the assembly machinery.[HAMAP-Rule:MF_01430]SURA_ECO57 Chaperone involved in the correct folding and assembly of outer membrane proteins. Recognizes specific patterns of aromatic residues and the orientation of their side chains, which are found more frequently in integral outer membrane proteins. May act in both early periplasmic and late outer membrane-associated steps of protein maturation. Publication Abstract from PubMed The outer membrane (OM) of Gram-negative bacteria acts as a permeability barrier against toxic compounds. Its integrity is maintained by various outer membrane proteins (OMPs), which are inserted into the OM by the beta-barrel assembly machinery (BAM) complex. The periplasmic chaperone SurA delivers unfolded OMPs to BAM; however, the mechanism of substrate transfer remains unclear. Here, we show that the flexible P1 and P2 domains of SurA regulate the function of its Core domain and interact with BAM components, including BamE, whose interaction with the P2 domain is crucial for efficient OMP assembly. Moreover, cryo-electron microscopy reveals four distinct Escherichia coli SurA-BAM structures, suggesting dynamic domain rearrangements of SurA. Based on these findings, we propose a dynamic model in which SurA transfers substrates to BAM through multiple conformational changes, providing a unified framework for chaperone-assisted OMP biogenesis. Cryo-EM structures of the SurA-BAM complex reveal conformational changes in outer membrane protein assembly.,Miyazaki R, Kohga H, Matsuoka N, Maruno Y, Yoshimoto W, Takahashi YS, Yanto DHY, Nugraha Y, Shigematsu H, Shiota T, Tsukazaki T Nat Commun. 2026 Sep 4;17(1):9061. doi: 10.1038/s41467-026-76843-3. PMID:42697891 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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