Open AccessProduction of the Ramoplanin Activity Analogue by Double Gene Inactivation
Author(s) -
Jiawei Han,
Junsheng Chen,
Lingyun Shao,
Junliang Zhang,
Xiaojing Dong,
Pengyu Liu,
Daijie Chen
Publication year - 2016
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0154121
Subject(s) - lipid ii , aglycone , microbiology and biotechnology , peptidoglycan , chemistry , biochemistry , biology , enzyme , stereochemistry , glycoside
Glycopeptides such as vancomycin and telavancin are essential for treating infections caused by Gram-positive bacteria. But the dwindling availability of new antibiotics and the emergence of resistant bacteria are making effective antibiotic treatment increasingly difficult. Ramoplanin, an inhibitor of bacterial cell wall biosynthesis, is a highly effective antibiotic against a wide range of Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus , vancomycin-intermediate resistant Clostridium difficile and vancomycin-resistant Enterococcus sp . Here, two tailoring enzyme genes in the biosynthesis of ramoplanin were deleted by double in-frame gene knockouts to produce new ramoplanin derivatives. The deschlororamoplanin A2 aglycone was purified and its structure was identified with LC-MS/MS. Deschlororamoplanin A2 aglycone and ramoplanin aglycone showed similar activity to ramoplanin A2. The results showed that α-1,2-dimannosyl disaccharide at Hpg 11 and chlorination at Chp 17 in the ramoplanin structure are not essential for its antimicrobial activity. This work provides new precursor compounds for the semisynthetic modification of ramoplanin.