9PH2

Crystal structure of Bordetella pertussis DsbA

Summary for 9PH2

• Entry DOI: 10.2210/pdb9ph2/pdb
• Descriptor: Thiol:disulfide interchange protein, DI(HYDROXYETHYL)ETHER (3 entities in total)
• Functional Keywords: trx, dsba, thiol-oxidase, disulphide, oxidoreductase
• Biological source: Bordetella pertussis
• Total number of polymer chains: 2
• Total formula weight: 39791.34

Authors

Penning, S.,Mitchell, L.,Heras, B.,Paxman, J.J. (deposition date: 2025-07-08, release date: 2025-12-31)

Primary citation

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

Experimental method

X-RAY DIFFRACTION (1.65 Å)