Peptidase family M23. Members of this family are zinc metallopeptidases with a range of specificities. The peptidase family M23 is included in this family, these are Gly-Gly endopeptidases. Peptidase family M23 are also endopeptidases. This family also includes some bacterial lipoproteins for which no proteolytic activity has been demonstrated. This family also includes leukocyte cell-derived chemotaxin 2 (LECT2) proteins. LECT2 is a liver-specific protein which is thought to be linked to hepatocyte growth although the exact function of this protein is unknown.

M23 family metallopeptidase, also known as beta-lytic metallopeptidase, and similar proteins. This model describes the metallopeptidase M23 family, which includes beta-lytic metallopeptidase and lysostaphin. Members of this family are zinc endopeptidases that lyse bacterial cell wall peptidoglycans; they cleave either the N-acylmuramoyl-Ala bond between the cell wall peptidoglycan and the cross-linking peptide (e.g. beta-lytic endopeptidase) or a bond within the cross-linking peptide (e.g. stapholysin, and lysostaphin). Beta-lytic metallopeptidase, formerly known as beta-lytic protease, has a preference for cleavage of Gly-X bonds and favors hydrophobic or apolar residues on either side. It inhibits growth of sensitive organisms and may potentially serve as an antimicrobial agent. Lysostaphin, produced by Staphylococcus genus, cleaves pentaglycine cross-bridges of cell wall peptidoglycan, acting as autolysins to maintain cell wall metabolism or as toxins and weapons against competing strains. Staphylolysin (also known as LasA) is implicated in a range of processes related to Pseudomonas virulence, including stimulating shedding of the ectodomain of cell surface heparan sulphate proteoglycan syndecan-1, and elastin degradation in connective tissue. Its active site is less constricted and contains a five-coordinate zinc ion with trigonal bipyramidal geometry and two metal-bound water molecules, possibly contributing to its activity against a wider range of substrates than those used by related lytic enzymes, consistent with its multiple roles in Pseudomonas virulence. The family includes members that do not appear to have the conserved zinc-binding site and might be lipoproteins lacking proteolytic activity.

Murein DD-endopeptidase MepM and murein hydrolase activator NlpD, contain LysM domain [Cell wall/membrane/envelope biogenesis].

Transglycosylase-like domain. This family of proteins are very likely to act as transglycosylase enzymes related to pfam00062 and pfam01464. These other families are weakly matched by this family, and include the known active site residues.

core lysozyme-like domain of resuscitation-promoting factor proteins. Resuscitation-promoting factor (RPF) proteins, found in various (G+C)-rich Gram-positive bacteria, act to reactivate cultures from stationary phase. This protein shares elements of the structural core of lysozyme and related proteins. Furthermore, it shares a conserved active site glutamate which is required for activity, and has a polysaccharide binding cleft that corresponds to the peptidoglycan binding cleft of lysozyme. Muralytic activity of Rpf in Micrococcus luteus correlates with resuscitation, supporting a mechanism dependent on cleavage of peptidoglycan by RPF.

ChainA, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],4KL7_B Chain B, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],4KL7_C Chain C, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],4KL7_D Chain D, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],4KPM_A Chain A, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],4KPM_B Chain B, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],4KPM_C Chain C, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],4KPM_D Chain D, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis]

ChainA, Probable resuscitation-promoting factor rpfB [Mycobacterium tuberculosis],4EMN_B Chain B, Probable resuscitation-promoting factor rpfB [Mycobacterium tuberculosis],4EMN_C Chain C, Probable resuscitation-promoting factor rpfB [Mycobacterium tuberculosis],4EMN_D Chain D, Probable resuscitation-promoting factor rpfB [Mycobacterium tuberculosis]

ChainA, Probable resuscitation-promoting factor rpfB [Mycobacterium tuberculosis]

ChainA, Resuscitation-promoting factor rpfB [Mycobacterium tuberculosis]

ChainA, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis],5E27_B Chain B, Resuscitation-promoting factor RpfB [Mycobacterium tuberculosis]

Resuscitation-promoting factor RpfA OS=Mycobacterium tuberculosis (strain CDC 1551 / Oshkosh) OX=83331 GN=rpfA PE=3 SV=1

Resuscitation-promoting factor RpfA OS=Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv) OX=83332 GN=rpfA PE=1 SV=1

Resuscitation-promoting factor Rpf1 OS=Corynebacterium glutamicum (strain ATCC 13032 / DSM 20300 / BCRC 11384 / JCM 1318 / LMG 3730 / NCIMB 10025) OX=196627 GN=rpf1 PE=3 SV=1

Resuscitation-promoting factor RpfB OS=Mycobacterium tuberculosis (strain ATCC 35801 / TMC 107 / Erdman) OX=652616 GN=rpfB PE=2 SV=1

Resuscitation-promoting factor RpfB OS=Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv) OX=83332 GN=rpfB PE=1 SV=1