Primary Citation of Related Structures: 2WW5, 2WWC, 2WWD
PubMed Abstract:
The first structure of a pneumococcal autolysin, that of the LytC lysozyme, has been solved in ternary complex with choline and a pneumococcal peptidoglycan (PG) fragment. The active site of the hydrolase module is not fully exposed but is oriented toward the choline-binding module, which accounts for its unique in vivo features in PG hydrolysis, its activation and its regulatory mechanisms ...
The first structure of a pneumococcal autolysin, that of the LytC lysozyme, has been solved in ternary complex with choline and a pneumococcal peptidoglycan (PG) fragment. The active site of the hydrolase module is not fully exposed but is oriented toward the choline-binding module, which accounts for its unique in vivo features in PG hydrolysis, its activation and its regulatory mechanisms. Because of the unusual hook-shaped conformation of the multimodular protein, it is only able to hydrolyze non-cross-linked PG chains, an assertion validated by additional experiments. These results explain the activation of LytC by choline-binding protein D (CbpD) in fratricide, a competence-programmed mechanism of predation of noncompetent sister cells. The results provide the first structural insights to our knowledge into the critical and central function that LytC plays in pneumococcal virulence and explain a long-standing puzzle of how murein hydrolases can be controlled to avoid self-lysis during bacterial growth and division.
Related Citations:
Insights Into the Structure-Function Relationships of Pneumococcal Cell Wall Lysozymes, Lytc and Cpl- 1. Monterroso, B., Saiz, J.L., Garcia, P., Garcia, J.L., Menendez, M. (2008) J Biol Chem 283: 28618
Unravelling the Structure of the Pneumococcal Autolytic Lysozyme. Monterroso, B., Lopez-Zumel, C., Garcia, J.L., Saiz, J.L., Garcia, P., Campillo, N.E., Menendez, M. (2005) Biochem J 391: 41
The Molecular Characterization of the First Autolytic Lysozyme of Streptococcus Pneumoniae Reveals Evolutionary Mobile Domains. Garcia, P., Paz Gonzalez, M., Garcia, E., Garcia, J.L., Lopez, R. (1999) Mol Microbiol 33: 128
Organizational Affiliation:
Grupo de Cristalografía Macromolecular y Biología Estructural, Instituto Química-Física Rocasolano, Consejo Superior de Investigaciones Científicas, Madrid, Spain.
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