4LJ1

RipD (Rv1566c) from Mycobacterium tuberculosis: a non-catalytic NlpC/p60 domain protein with two penta-peptide repeat units (PVQQA-PVQPA)

4LJ1 の概要

• エントリーDOI: 10.2210/pdb4lj1/pdb
• 分子名称: Invasion-associated protein (2 entities in total)
• 機能のキーワード: nlpc/p60, cell wall stabilisation, periplasmic, cell invasion
• 由来する生物種: Mycobacterium tuberculosis
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 15438.56

構造登録者

Both, D.,Steiner, E.M.,Linder, D.C.,Schnell, R.,Schneider, G. (登録日: 2013-07-04, 公開日: 2013-11-06, 最終更新日: 2024-03-20)

主引用文献

Both, D.,Steiner, E.M.,Izumi, A.,Schneider, G.,Schnell, R.
RipD (Rv1566c) from Mycobacterium tuberculosis: adaptation of an NlpC/p60 domain to a non-catalytic peptidoglycan-binding function.
Biochem.J., 457:33-41, 2014

PubMed Abstract: Enzymes carrying NlpC/p60 domains, for instance RipA and RipB from Mycobacterium tuberculosis, are bacterial peptidoglycan hydrolases that cleave the peptide stems and contribute to cell wall remodelling during cell division. A member of this protein family, RipD (Rv1566c) from M. tuberculosis described in the present study, displays sequence alterations in the NlpC/p60 catalytic triad and carries a pentapeptide repeat at its C-terminus. Bioinformatics analysis revealed RipD-like proteins in eleven mycobacterial genomes, whereas similar pentapeptide repeats occur in cell-wall-localized bacterial proteins and in a mycobacteriophage. In contrast with previously known members of the NlpC/p60 family, RipD does not show peptidoglycan hydrolase activity, which is consistent with the sequence alterations at the catalytic site. A strong interaction of the catalytically inactive core domain with peptidoglycan is however retained, presenting the first example of the NlpC/p60 domains that evolved to a non-catalytic peptidoglycan-binding function. Full-length RipD carrying the C-terminal repeat shows, however, a decrease in binding affinity to peptidoglycan, suggesting that the C-terminal tail modulates the interaction with bacterial cell wall components. The pentapeptide repeat at the C-terminus does not adopt a defined secondary structure in solution which is in accordance with results from the 1.17 Å (1 Å=0.1 nm) crystal structure of the protein carrying two repeat units.

PubMed: 24107184
DOI: 10.1042/BJ20131227

実験手法

X-RAY DIFFRACTION (1.17 Å)