Cortical fragment-lytic enzyme (CFLE) is a peptidoglycan hydrolase involved in bacterial endospore germination. CFLE is expressed as an inactive preprotein (called SleB) in the forespore compartment of sporulating cells. SleB translocates across the forespore inner membrane and is deposited as a mature enzyme in the cortex layer of the spore. As part of a sensory mechanism capable of initiating germination, CFLE degrades a spore-specific peptidoglycan constituent called muramic-acid delta-lactam that comprises the outer cortex. CFLE has a C-terminal glycosyl hydrolase family 18 (GH18) catalytic domain as well as two N-terminal LysM peptidoglycan-binding domains. In addition to SleB, this family includes YaaH, YdhD, and YvbX from Bacillus subtilis.

Spore germination protein YaaH [Cell cycle control, cell division, chromosome partitioning].

Glyco_18 domain.

Carbohydrate Binding Module 6 (CBM6) and CBM35_like superfamily. Carbohydrate binding module family 6 (CBM6, family 6 CBM), also known as cellulose binding domain family VI (CBD VI), and related CBMs (CBM35 and CBM36). These are non-catalytic carbohydrate binding domains found in a range of enzymes that display activities against a diverse range of carbohydrate targets, including mannan, xylan, beta-glucans, cellulose, agarose, and arabinans. These domains facilitate the strong binding of the appended catalytic modules to their dedicated, insoluble substrates. Many of these CBMs are associated with glycoside hydrolase (GH) domains. CBM6 is an unusual CBM as it represents a chimera of two distinct binding sites with different modes of binding: binding site I within the loop regions and binding site II on the concave face of the beta-sandwich fold. CBM36s are calcium-dependent xylan binding domains. CBM35s display conserved specificity through extensive sequence similarity, but divergent function through their appended catalytic modules. This alignment model also contains the C-terminal domains of bacterial insecticidal toxins, where they may be involved in determining insect specificity through carbohydrate binding functionality.

Glycosyl hydrolases family 18.

Crystalstructure of the Bacillus cereus spore cortex-lytic enzyme SleL [Bacillus cereus ATCC 10876],4S3J_B Crystal structure of the Bacillus cereus spore cortex-lytic enzyme SleL [Bacillus cereus ATCC 10876],4S3J_C Crystal structure of the Bacillus cereus spore cortex-lytic enzyme SleL [Bacillus cereus ATCC 10876]

ChainA, Glycoside hydrolase family 18 [Desulfitobacterium hafniense DCB-2],4WIW_B Chain B, Glycoside hydrolase family 18 [Desulfitobacterium hafniense DCB-2],4WIW_C Chain C, Glycoside hydrolase family 18 [Desulfitobacterium hafniense DCB-2],4WIW_D Chain D, Glycoside hydrolase family 18 [Desulfitobacterium hafniense DCB-2],4WIW_E Chain E, Glycoside hydrolase family 18 [Desulfitobacterium hafniense DCB-2],4WIW_F Chain F, Glycoside hydrolase family 18 [Desulfitobacterium hafniense DCB-2]

Crystalstructure of chitinase from Chromobacterium violaceum ATCC 12472 [Chromobacterium violaceum ATCC 12472]

Cortical fragment-lytic enzyme OS=Bacillus anthracis OX=1392 GN=sleL PE=2 SV=1

Cortical fragment-lytic enzyme OS=Bacillus cereus OX=1396 GN=sleL PE=1 SV=1