The LytC lysozyme of Streptococcus pneumoniae is a bacterial cell wall hydrolase that cleaves the beta1-4-glycosydic bond located between the N-acetylmuramoyl-N-glucosaminyl residues of the cell wall polysaccharide chains. LytC is composed of a C-terminal glycosyl hydrolase family 25 (GH25) domain and an N-terminal choline-binding module (CBM) consisting of eleven homologous repeats that specifically recognizes the choline residues of pneumococcal lipoteichoic and teichoic acids. This domain arrangement is the reverse of the major pneumococcal autolysin, LytA, and the CPL-1-like lytic enzymes of the pneumococcal bacteriophages, in which the CBM (consisting of six repeats) is at the C-terminus. This model represents the C-terminal catalytic domain of the LytC-like enzymes.

Endo-N-acetylmuramidases (muramidases) are lysozymes (also referred to as peptidoglycan hydrolases) that degrade bacterial cell walls by catalyzing the hydrolysis of 1,4-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues. This family of muramidases contains a glycosyl hydrolase family 25 (GH25) catalytic domain and is found in bacteria, fungi, slime molds, round worms, protozoans and bacteriophages. The bacteriophage members are referred to as endolysins which are involved in lysing the host cell at the end of the replication cycle to allow release of mature phage particles. Endolysins are typically modular enzymes consisting of a catalytically active domain that hydrolyzes the peptidoglycan cell wall and a cell wall-binding domain that anchors the protein to the cell wall. Endolysins generally have narrow substrate specificities with either intra-species or intra-genus bacteriolytic activity.

YegX is an uncharacterized bacterial protein with a glycosyl hydrolase family 25 (GH25) catalytic domain that is similar in sequence to the CH-type (Chalaropsis-type) lysozymes of the GH25 family of endolysins.

Lyc muramidase is an autolytic lysozyme (autolysin) from Clostridium acetobutylicum encoded by the lyc gene. Lyc has a glycosyl hydrolase family 25 (GH25) catalytic domain. Endo-N-acetylmuramidases are lysozymes (also referred to as peptidoglycan hydrolases) that degrade bacterial cell walls by catalyzing the hydrolysis of 1,4-beta-linkages between N-acetylmuramic acid and N-acetyl-D-glucosamine residues.

Lyzozyme M1 (1,4-beta-N-acetylmuramidase), GH25 family [Cell wall/membrane/envelope biogenesis].

3D-structureof the modular autolysin LytC from Streptococcus pneumoniae at 1.6 A resolution [Streptococcus pneumoniae R6],2WWD_A 3D-structure of the modular autolysin LytC from Streptococcus pneumoniae in complex with pneummococcal peptidoglycan fragment [Streptococcus pneumoniae R6]

3D-structureof the modular autolysin LytC from Streptococcus pneumoniae in complex with synthetic peptidoglycan ligand [Streptococcus pneumoniae R6]

Crystalstructure of the CTP1L endolysin reveals how its activity is regulated by a secondary translation product [Clostridium phage phiCTP1]

TheStructure of a family 25 Glycosyl hydrolase from Bacillus anthracis. [Bacillus anthracis str. Ames]

Crystalstructure of the Clostridium perfringens spore cortex lytic enzyme SleM [Clostridium perfringens],5JIP_B Crystal structure of the Clostridium perfringens spore cortex lytic enzyme SleM [Clostridium perfringens]

Probable autolytic lysozyme OS=Clostridium perfringens (strain 13 / Type A) OX=195102 GN=lyc PE=3 SV=2

Probable cell wall hydrolase LytN OS=Staphylococcus aureus (strain COL) OX=93062 GN=lytN PE=3 SV=1

Probable cell wall hydrolase LytN OS=Staphylococcus aureus (strain MSSA476) OX=282459 GN=lytN PE=3 SV=2

Probable cell wall hydrolase LytN OS=Staphylococcus aureus (strain MRSA252) OX=282458 GN=lytN PE=3 SV=2

Probable cell wall hydrolase LytN OS=Staphylococcus aureus (strain MW2) OX=196620 GN=lytN PE=3 SV=2