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Peptidoglycan Hydrolase LytF Plays a Role in Cell Separation with CwlF during Vegetative Growth of Bacillus subtilis

ABSTRACT Peptidoglycan hydrolase, LytF (CwlE), was determined to be identical to YhdD (deduced cell wall binding protein) by zymography after insertional inactivation of the yhdD gene. YhdD exhibits high sequence similarity with CwlF (PapQ, LytE) and p60 ofListeria monocytogenes. The N-terminal region of YhdD has a signal sequence followed by five tandem repeated regions containing polyserine residues. The C-terminal region corresponds to the catalytic domain, because a truncated protein without the N-terminal region retained cell wall hydrolase activity. The histidine-tagged LytF protein produced in Escherichia coli cells hydrolyzed the linkage of d-γ-glutamyl-meso-diaminopimelic acid in murein peptides, indicating that it is ad,l-endopeptidase. Northern hybridization and primer extension analyses indicated that the lytF gene was transcribed by EςD RNA polymerase. Disruption oflytF led to slightly filamentous cells, and a lytF cwlF double mutant exhibited extraordinary microfiber formation, which is similar to the cell morphology of the cwlF sigDmutant.