標題: Structural Insights into Substrate Recognition by Clostridium difficile Sortase
作者: Yin, Jui-Chieh
Fei, Chun-Hsien
Lo, Yen-Chen
Hsiao, Yu-Yuan
Chang, Jyun-Cyuan
Nix, Jay C.
Chang, Yuan-Yu
Yang, Lee-Wei
Huang, I-Hsiu
Wang, Shuying
生物科技學系
Department of Biological Science and Technology
關鍵字: Clostridium difficile;sortase;substrate specificity;crystal structure;fluorescence resonance energy transfer
公開日期: 22-Nov-2016
摘要: Sortases function as cysteine transpeptidases that catalyze the covalent attachment of virulence-associated surface proteins into the cell wall peptidoglycan in Gram-positive bacteria. The substrate proteins targeted by sortase enzymes have a cell wall sorting signal (CWSS) located at the C-terminus. Up to date, it is still not well understood how sortases with structural resemblance among different classes and diverse species of bacteria achieve substrate specificity. In this study, we focus on elucidating the molecular basis for specific recognition of peptide substrate PPKTG by Clostridium difficile sortase B (Cd-SrtB). Combining structural studies, biochemical assays and molecular dynamics simulations, we have constructed a computational model of Cd-SrtB(Delta N26)PPKTG complex and have validated the model by site-directed mutagensis studies and fluorescence resonance energy transfer (FRET)-based assay. Furthermore, we have revealed that the fourth amino acid in the N-terminal direction from cleavage site of PPKTG forms specific interaction with Cd-SrtB and plays an essential role in configuring the peptide to allow more efficient substrate-specific cleavage by Cd-SrtB.
URI: http://dx.doi.org/10.3389/fcimb.2016.00160
http://hdl.handle.net/11536/132810
ISSN: 2235-2988
DOI: 10.3389/fcimb.2016.00160
期刊: FRONTIERS IN CELLULAR AND INFECTION MICROBIOLOGY
Volume: 6
起始頁: 0
結束頁: 0
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