Type All lantibiotic bovicin HJ50 with a rare disulfide bond: structure, structure-activity relationships and mode of action----中国科学院微生物研究所

科研成果

论文题目:	Type All lantibiotic bovicin HJ50 with a rare disulfide bond: structure, structure-activity relationships and mode of action
作者:	Zhang Jie#, Feng Yingang#, Teng Kunling, Lin Yuheng, Gao Yong, Wang Jinfeng, Zhong Jin
联系作者:	Wang Jinfeng, Zhong Jin
刊物名称:	Biochemical Journal
期:	461
卷:
页:	497-508
年份:	2014
影响因子:	4.95
论文下载:	http://www.biochemj.org/bj/461/bj4610497.htm
摘要:	Lantibiotics are ribosomally synthesized antimicrobial peptides containing unusual amino acids. As promising alternatives to conventional antibiotics, they have a high potential for alleviating the problem of emergent antibiotic resistance, with possible applications in many industries that have antibacterial demand. Bovicin HJ50 is a type AII lantibiotic, the largest group of lantibiotics, comprising a linear N-terminal region and a globular C-terminal region. Interestingly, bovicin H50 has a disulfide bond that is rare in this group. Owing to limited information about the spatial structures of type AII lantibiotics, the functional regions of this type and the role of the disulfide bond are still unknown. In the present study, we resolved the solution structure of bovicin HJ50 using NMR spectroscopy. This is the first spatial structure of a type AII lantibiotic. Bovicin HJ50 exhibited high flexibility in aqueous solution, whereas varied rigidities were observed in the different rings with the conserved ring A being the most rigid. The charged residues Lys(11), Asp(12) and Lys(30), as well as the essential disulfide bond were critical for antimicrobial activity. Importantly, bovicin HJ50 showed not only peptidoglycan precursor lipid II-binding ability, but also pore-forming activity, which is significantly different from other bacteriostatic type AII lantibiotics, suggesting a novel antimicrobial mechanism.