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Structure-Function Relationship of Aminopeptidase P from Pseudomonas aeruginosa.


ABSTRACT: PepP is a virulence-associated gene in Pseudomonas aeruginosa, making it an attractive target for anti-P. aeruginosa drug development. The encoded protein, aminopeptidases P (Pa-PepP), is a type of X-prolyl peptidase that possesses diverse biological functions. The crystal structure verified its canonical pita-bread fold and functional tetrameric assembly, and the functional studies measured the influences of different metal ions on the activity. A trimetal manganese cluster was observed at the active site, elucidating the mechanism of inhibition by metal ions. Additionally, a loop extending from the active site appeared to be important for specific large-substrate binding. Based on the structural comparison and bacterial invasion assays, we showed that this non-conserved surface loop was critical for P. aeruginosa virulence. Taken together, these findings can extend our understanding of the catalytic mechanism and virulence-related functions of Pa-PepP and provide a solid foundation for the design of specific inhibitors against pathogenic-bacterial infections.

SUBMITTER: Peng CT 

PROVIDER: S-EPMC5723419 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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Structure-Function Relationship of Aminopeptidase P from <i>Pseudomonas aeruginosa</i>.

Peng Cui-Ting CT   Liu Li L   Li Chang-Cheng CC   He Li-Hui LH   Li Tao T   Shen Ya-Lin YL   Gao Chao C   Wang Ning-Yu NY   Xia Yong Y   Zhu Yi-Bo YB   Song Ying-Jie YJ   Lei Qian Q   Yu Luo-Ting LT   Bao Rui R  

Frontiers in microbiology 20171205


<i>PepP</i> is a virulence-associated gene in <i>Pseudomonas aeruginosa</i>, making it an attractive target for anti<i>-P. aeruginosa</i> drug development. The encoded protein, aminopeptidases P (Pa-PepP), is a type of X-prolyl peptidase that possesses diverse biological functions. The crystal structure verified its canonical pita-bread fold and functional tetrameric assembly, and the functional studies measured the influences of different metal ions on the activity. A trimetal manganese cluster  ...[more]

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