6n40

Structural highlights

Function

MMPL3_MYCS2 Transports trehalose monomycolate (TMM) to the cell wall (PubMed:31239378, PubMed:22520756, PubMed:28698380). Flips TMM across the inner membrane. Membrane potential is not required for this function (PubMed:28698380). Transports probably phosphatidylethanolamine (PE) as well. Binds specifically both TMM and PE, but not trehalose dimycolate (TDM). Binds also diacylglycerol (DAG) and other phospholipids, including phosphatidylglycerol (PG), phosphatidylinositol (PI), and cardiolipin (CDL) (PubMed:31113875). Contributes to membrane potential, cell wall composition, antibiotic susceptibility and fitness (PubMed:28703701).^{[1] [2] [3] [4] [5]}

References

1. ↑ Varela C, Rittmann D, Singh A, Krumbach K, Bhatt K, Eggeling L, Besra GS, Bhatt A. MmpL genes are associated with mycolic acid metabolism in mycobacteria and corynebacteria. Chem Biol. 2012 Apr 20;19(4):498-506. doi: 10.1016/j.chembiol.2012.03.006. PMID:22520756 doi:http://dx.doi.org/10.1016/j.chembiol.2012.03.006
2. ↑ Xu Z, Meshcheryakov VA, Poce G, Chng SS. MmpL3 is the flippase for mycolic acids in mycobacteria. Proc Natl Acad Sci U S A. 2017 Jul 25;114(30):7993-7998. doi:, 10.1073/pnas.1700062114. Epub 2017 Jul 11. PMID:28698380 doi:http://dx.doi.org/10.1073/pnas.1700062114
3. ↑ McNeil MB, Dennison D, Parish T. Mutations in MmpL3 alter membrane potential, hydrophobicity and antibiotic susceptibility in Mycobacterium smegmatis. Microbiology (Reading). 2017 Jul;163(7):1065-1070. doi: 10.1099/mic.0.000498., Epub 2017 Jul 21. PMID:28703701 doi:http://dx.doi.org/10.1099/mic.0.000498
4. ↑ Su CC, Klenotic PA, Bolla JR, Purdy GE, Robinson CV, Yu EW. MmpL3 is a lipid transporter that binds trehalose monomycolate and phosphatidylethanolamine. Proc Natl Acad Sci U S A. 2019 May 21. pii: 1901346116. doi:, 10.1073/pnas.1901346116. PMID:31113875 doi:http://dx.doi.org/10.1073/pnas.1901346116
5. ↑ Fay A, Czudnochowski N, Rock JM, Johnson JR, Krogan NJ, Rosenberg O, Glickman MS. Two Accessory Proteins Govern MmpL3 Mycolic Acid Transport in Mycobacteria. mBio. 2019 Jun 25;10(3). pii: mBio.00850-19. doi: 10.1128/mBio.00850-19. PMID:31239378 doi:http://dx.doi.org/10.1128/mBio.00850-19