Structural basis for the recognition of lysozyme by MliC, a periplasmic lysozyme inhibitor in Gram-negative bacteria
| Autor: | Kwang Min Choe, Ji Hee Gong, Moon Jong Kim, Soohwan Yum, Yongbin Xu, Bok Luel Lee, Nam-Chul Ha, Hee Young Yoo, Ji Won Park, Xiao Ling Jin |
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| Rok vydání: | 2009 |
| Předmět: |
Gram-negative bacteria
Biophysics Virulence Biochemistry Protein Structure Secondary Bacterial cell structure Microbiology chemistry.chemical_compound Bacterial Proteins Animals Molecular Biology chemistry.chemical_classification biology Cell Biology Periplasmic space biology.organism_classification Protein Structure Tertiary Enzyme chemistry Periplasm Pseudomonas aeruginosa Muramidase Peptidoglycan Lysozyme Dimerization Bacteria |
| Zdroj: | Biochemical and Biophysical Research Communications. 378:244-248 |
| ISSN: | 0006-291X |
| DOI: | 10.1016/j.bbrc.2008.11.039 |
| Popis: | Lysozymes are an important component of the innate immune system of animals that hydrolyze peptidoglycan, the major bacterial cell wall constituent. Many bacteria have contrived various means of dealing with this bactericidal enzyme, one of which is to produce lysozyme inhibitors. Recently, a novel family of bacterial lysozyme inhibitors was identified in various Gram-negative bacteria, named MliC (membrane bound lysozyme inhibitor of C-type lysozyme). Here, we report the crystal structure of Pseudomonas aeruginosa MliC in complex with chicken egg white lysozyme. Combined with mutational study, the complex structure demonstrates that the invariant loop of MliC plays a crucial role in the inhibition of the lysozyme by its insertion to the active site cleft of the lysozyme, where the loop forms hydrogen and ionic bonds with the catalytic residues. Since MliC family members have been implicated as putative colonization or virulence factors, the structures and mechanism of action of MliC will be of relevance to the control of bacterial growth in animal hosts. |
| Databáze: | OpenAIRE |
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