Characterization of NMCR-2, a new non-mobile colistin resistance enzyme: implications for an MCR-8 ancestor.

Environmental Microbiology
Saif UllahYoujun Feng

Abstract

MCR-4 and MCR-8 are two recently identified members of an ongoing MCR family of colistin resistance. Although that aquatic reservoir for MCR-4 is proposed, the origin and mechanism of MCR-8 is poorly understood. Here we report a previously unrecognized non-mobile colistin resistance enzyme, termed NMCR-2, originating from the plant pathogen Kosakonia pseudosacchari. NMCR-2 (551aa) gives 67.3% identity to MCR-8 (565aa). NMCR-2 is placed as a progenitor/ancestor for MCR-8 in phylogeny of MCR members. Genetic study reveals that nmcr-2 is comparable to mcr-8 in the ability of producing phenotypic colistin resistance. Biochemical analyses determine that these two enzymes catalyse the transfer of PEA from the donor PE lipid substrate to the recipient lipid A molecule by a putative 'ping-pong' trade-off. Further experiment of protein engineering demonstrates that the two motifs (TM region and catalytic domain) of NMCR-2 are functionally exchangeable with that of MCR-8, rather than MCR-1. Physiological impacts of nmcr-2 and/or mcr-8 are detected in Escherichia coli, featuring with fitness cost. Evidently, the action and mechanism of NMCR-2 is analogous to that of MCR-8. Therefore, our finding underlines that NMCR-2 might be a possible ...Continue Reading

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Citations

Feb 27, 2021·Enfermedades infecciosas y microbiología clínica·Shuan-Cheng BaiXiao-Ping Liao
May 10, 2021·Journal of Global Antimicrobial Resistance·Claudine FournierLaurent Poirel
May 20, 2021·Cell Reports·Yongchang XuYoujun Feng
Aug 9, 2021·Journal of Global Antimicrobial Resistance·Linlin XieJun Li
Aug 23, 2021·International Journal of Antimicrobial Agents·J Rodríguez-SantiagoU Garza-Ramos

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