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.

CwlT-like N-terminal lysozyme domain and similar domains. CwlT is a bifunctional cell wall hydrolase containing an N-terminal lysozyme domain and a C-terminal NlpC/P60 endopeptidase domain (gamma-d-D-glutamyl-L-diamino acid endopeptidase), and has been implicated in the spread of transposons. Proteins similar to this family include the soluble and insoluble membrane-bound LTs in bacteria, the LTs in bacteriophage lambda, as well as the eukaryotic "goose-type" lysozymes (goose egg-white lysozyme; GEWL).

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].

Lysozyme-like.

Catalyticdomain of the antimicrobial peptidase lysostaphin from Staphylococcus simulans crystallized in the presence of phosphate [Staphylococcus simulans bv. staphylolyticus],4QP5_B Catalytic domain of the antimicrobial peptidase lysostaphin from Staphylococcus simulans crystallized in the presence of phosphate [Staphylococcus simulans bv. staphylolyticus],4QPB_A Catalytic domain of the antimicrobial peptidase lysostaphin from Staphylococcus simulans crystallized in the absence of phosphate [Staphylococcus simulans],4QPB_B Catalytic domain of the antimicrobial peptidase lysostaphin from Staphylococcus simulans crystallized in the absence of phosphate [Staphylococcus simulans]

NMRsolution structure of lysostaphin [Staphylococcus simulans]

Theantimicrobial peptidase lysostaphin from Staphylococcus simulans [Staphylococcus simulans],4LXC_B The antimicrobial peptidase lysostaphin from Staphylococcus simulans [Staphylococcus simulans],4LXC_C The antimicrobial peptidase lysostaphin from Staphylococcus simulans [Staphylococcus simulans],4LXC_D The antimicrobial peptidase lysostaphin from Staphylococcus simulans [Staphylococcus simulans]

LysostaphinSH3b P4-G5 complex, synchrotron dataset [Staphylococcus simulans]

ShyAEndopeptidase from Vibrio cholerae (Closed form) [Vibrio cholerae O1 biovar El Tor str. N16961],6UE4_B ShyA Endopeptidase from Vibrio cholerae (Closed form) [Vibrio cholerae O1 biovar El Tor str. N16961]

Probable endopeptidase YddH OS=Bacillus subtilis (strain 168) OX=224308 GN=yddH PE=3 SV=1

Probable tape measure protein OS=Bacillus phage SPbeta OX=66797 GN=yomI PE=3 SV=1

SPbeta prophage-derived uncharacterized transglycosylase YomI OS=Bacillus subtilis (strain 168) OX=224308 GN=yomI PE=3 SV=2

Lysostaphin OS=Staphylococcus simulans OX=1286 GN=lss PE=1 SV=2

Uncharacterized metalloprotease bbp_296 OS=Buchnera aphidicola subsp. Baizongia pistaciae (strain Bp) OX=224915 GN=bbp_296 PE=3 SV=1