9PH2

Crystal structure of Bordetella pertussis DsbA

9PH2 の概要

• エントリーDOI: 10.2210/pdb9ph2/pdb
• 分子名称: Thiol:disulfide interchange protein, DI(HYDROXYETHYL)ETHER (3 entities in total)
• 機能のキーワード: trx, dsba, thiol-oxidase, disulphide, oxidoreductase
• 由来する生物種: Bordetella pertussis
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 39791.34

構造登録者

Penning, S.,Mitchell, L.,Heras, B.,Paxman, J.J. (登録日: 2025-07-08, 公開日: 2025-12-31)

主引用文献

Penning, S.,Mitchell, L.,Hong, Y.,Cunliffe, T.,Subedi, P.,Wang, G.,Hor, L.,Totsika, M.,Paxman, J.J.,Heras, B.
Structural and functional specialization of Bordetella pertussis DsbA for pertussis toxin folding.
Protein Sci., 35:e70421-e70421, 2026

PubMed Abstract: Disulphide bonds (Dsbs) are essential for the folding, stability, and function of many secreted and membrane-associated proteins in bacteria. In Gram-negative species, these bonds are introduced by the Dsb enzyme family, with DsbA acting as the primary thiol oxidase. While DsbA proteins share a conserved thioredoxin (TRX)-like fold, emerging evidence highlights substantial structural and functional divergence among pathogenic homologues. Here, we present the high-resolution crystal structure and functional characterization of BperDsbA, a DsbA homologue from Bordetella pertussis, the causative agent of whooping cough. BperDsbA adopts a canonical TRX fold with a CPHC active site and a threonine-containing cis-proline loop, but displays striking deviations from prototypical DsbAs. Notably, it contains a highly destabilizing catalytic Dsb, resulting in one of the most oxidizing redox potentials recorded for a DsbA enzyme. Surface electrostatic analysis reveals an unusual distribution of positive and negative charge around the active site, in contrast to the broadly hydrophobic catalytic surfaces of other DsbAs. Functionally, BperDsbA shows limited substrate promiscuity and selectively catalyzes the oxidative folding of a pertussis toxin-derived peptide, supporting a model of substrate specialization. Together, these findings suggest that BperDsbA has evolved unique redox and structural features to support virulence factor maturation in B. pertussis. This work expands our understanding of the mechanistic diversity of DsbA enzymes and highlights their potential as pathogen-specific targets for anti-virulence therapeutics.

PubMed: 41432344
DOI: 10.1002/pro.70421

実験手法

X-RAY DIFFRACTION (1.65 Å)