Download MendeleyUnique dimeric structure of the DUF2891 family protein CJ0554 from Campylobacter jejuni.
Kim, S.Y., Cho, H.Y., Yoon, S.I.(2023) Biochem Biophys Res Commun 655: 11-17
- PubMed: 36913761
- DOI: https://doi.org/10.1016/j.bbrc.2023.03.010
- Primary Citation of Related Structures:
8IEU, 8IEV - PubMed Abstract:
Campylobacter jejuni is a pathogenic bacterium that causes enteritis and Guillain-Barre syndrome in humans. To identify a protein target for the development of a new therapeutic against C. jejuni infection, each gene product of C. jejuni must be functionally characterized. The cj0554 gene of C. jejuni encodes a DUF2891 family protein with unknown functions. To provide functional insights into CJ0554, we determined and analyzed the crystal structure of the CJ0554 protein. CJ0554 adopts an (α/α) 6 -barrel structure, which consists of an inner α 6 ring and an outer α 6 ring. CJ0554 assembles into a dimer in a unique top-to-top orientation that is not observed in its structural homologs, N-acetylglucosamine 2-epimerase superfamily members. Dimer formation was verified by analyzing CJ0554 and its ortholog protein through gel-filtration chromatography. The top of the CJ0554 monomer barrel harbors a cavity, which is connected to that of the second subunit in the dimer structure, generating a larger intersubunit cavity. This elongated cavity accommodates extra nonproteinaceous electron density, presumably as a pseudosubstrate, and is lined with generally catalytically active histidine residues that are invariant in CJ0554 orthologs. Therefore, we propose that the cavity functions as the active site of CJ0554.
Organizational Affiliation:
Division of Biomedical Convergence, College of Biomedical Science, Kangwon National University, Chuncheon, 24341, Republic of Korea.
