8RKL | pdb_00008rkl

Experimental Data Snapshot

wwPDB Validation 3D Report Full Report

This is version 1.0 of the entry. See complete history.

(2024) Nat Commun 15: 6635-6635

PubMed Abstract:
The bacterial tight adherence pilus system (TadPS) assembles surface pili essential for adhesion and colonisation in many human pathogens. Pilus dynamics are powered by the ATPase CpaF (TadA), which drives extension and retraction cycles in Caulobacter crescentus through an unknown mechanism. Here we use cryogenic electron microscopy and cell-based light microscopy to characterise CpaF mechanism. We show that CpaF assembles into a hexamer with C2 symmetry in different nucleotide states. Nucleotide cycling occurs through an intra-subunit clamp-like mechanism that promotes sequential conformational changes between subunits. Moreover, a comparison of the active sites with different nucleotides bound suggests a mechanism for bidirectional motion. Conserved CpaF residues, predicted to interact with platform proteins CpaG (TadB) and CpaH (TadC), are mutated in vivo to establish their role in pilus processing. Our findings provide a model for how CpaF drives TadPS pilus dynamics and have broad implications for how other ancient type 4 filament family members power pilus assembly.

Organizational Affiliation

Macromolecule Content

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Pilus assembly ATPase CpaF	A, B, C, D, E A, B, C, D, E, F	423	Caulobacter vibrioides NA1000	Mutation(s): 0 Gene Names: cpaF, CCNA_03037
UniProt
Find proteins for A0A0H3CDS2 (Caulobacter vibrioides (strain NA1000 / CB15N)) Explore A0A0H3CDS2 Go to UniProtKB: A0A0H3CDS2
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	A0A0H3CDS2
Sequence Annotations Expand
Reference Sequence

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
EPE Query on EPE Download:Ideal Coordinates CCD File SDF format, chain J [auth E] SDF format, chain I [auth D] SDF format, chain H [auth B] SDF format, chain G [auth A] MOL2 format, chain J [auth E] MOL2 format, chain I [auth D] MOL2 format, chain H [auth B] MOL2 format, chain G [auth A] mmCIF format, chain J [auth E] mmCIF format, chain I [auth D] mmCIF format, chain H [auth B] mmCIF format, chain G [auth A]	G [auth A], H [auth B], I [auth D], J [auth E]	4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID C₈ H₁₈ N₂ O₄ S JKMHFZQWWAIEOD-UHFFFAOYSA-N		Interactions Focus chain G [auth A] Focus chain H [auth B] Focus chain I [auth D] Focus chain J [auth E] Interactions & Density Focus chain G [auth A] Focus chain H [auth B] Focus chain I [auth D] Focus chain J [auth E]