3PBI

Structure of the peptidoglycan hydrolase RipB (Rv1478) from Mycobacterium tuberculosis at 1.6 resolution

Summary for 3PBI

• Entry DOI: 10.2210/pdb3pbi/pdb
• Related: 3PBC 3S0Q
• Descriptor: INVASION PROTEIN (2 entities in total)
• Functional Keywords: peptidoglycan hydrolase, extracellular, invasion related protein, cell wall, nlpc-like module, hydrolase
• Biological source: Mycobacterium tuberculosis
• Total number of polymer chains: 1
• Total formula weight: 21733.35

Authors

Schnell, R.,Both, D.,Schneider, G. (deposition date: 2010-10-20, release date: 2011-08-31, Last modification date: 2023-09-06)

Primary citation

Both, D.,Schneider, G.,Schnell, R.
Peptidoglycan Remodeling in Mycobacterium tuberculosis: Comparison of Structures and Catalytic Activities of RipA and RipB.
J.Mol.Biol., 413:247-260, 2011

PubMed Abstract: The success of Mycobacterium tuberculosis in sustaining long-term survival within the host macrophages partly relies on its unique cell envelop that also confers low susceptibility to several antibiotics. Remodeling of the septal peptidoglycan (PG) has been linked to the putative PG hydrolases RipA and RipB. The crystal structures of RipB (Rv1478) and the homologous module of RipA (Rv1477) were determined to 1.60 Å and 1.38 Å resolution, respectively. Both proteins contain a C-terminal core domain resembling the NlpC-type PG hydrolases. However, the structure of RipB exhibits striking differences to the structures of this domain in RipA reported here and previously by others. Major structural differences were found in the N-terminal segments of 70 amino acids and in an adjacent loop, which form part of the substrate binding groove. Both RipA and RipB are able to bind PG. RipA, its C-terminal module and RipB cleave defined PG fragments between d-glutamate and meso-diaminopimelate with pH optima of 5 and 6, respectively. The peptidase module of RipA is also able to degrade Bacillus subtilis PG, which displays peptide stems and cross-links identical with those found in mycobacterial murein. RipB did not show comparable hydrolase activity with this substrate. Removal of the N-terminal segments previously suggested to have a role in auto-inhibition did not change the activity of either RipA or RipB. A comparison of the putative active-site clefts in the two enzymes provides structural insights into the basis of the differences in their substrate specificity.

PubMed: 21864539
DOI: 10.1016/j.jmb.2011.08.014

Experimental method

X-RAY DIFFRACTION (1.6 Å)