Molecular Basis of Substrate Polyspecificity of the Candida albicans Mdr1p Multidrug/H+ Antiporter. Issue 5 (2nd March 2018)

• Record Type: Journal Article
• Authors: Redhu, Archana Kumari; Banerjee, Atanu; Shah, Abdul Haseeb; Moreno, Alexis; Rawal, Manpreet Kaur; Nair, Remya; Falson, Pierre; Prasad, Rajendra
• Is Part Of: Journal of molecular biology. Volume 430:Issue 5(2018)
• Page Start: 682
• Page End: 694
• Publication Date: 2018-03-02
• Subjects: MFS Major Facilitator Superfamily -- DHA-1 Drug H+ Antiporter-1 family -- Mdr1p Multidrug resistance 1 protein -- TMS Transmembrane segment -- TMD Transmembrane domain -- FLC Fluconazole -- CHX Cycloheximide -- MTX Methotrexate -- 4-NQO 4-Nitroquinoline -- DMSO Dimethylsulfoxide -- NR Nile red -- WT Wild type -- RFU Relative Fluorescence Units -- PM Plasma membrane; Candida albicans -- Mdr1 -- Multidrug resistance -- Polyspecificity -- MFS; Molecular biology -- Periodicals; Biology -- Periodicals; Biochemistry -- Periodicals; Bacteriology -- Periodicals; Molecular Biology -- Periodicals; Biochemistry -- Periodicals; Biologie moléculaire -- Périodiques; Biologie -- Périodiques; Biochimie -- Périodiques; Moleculaire biologie; Biochemistry; Biology; Molecular biology; Periodicals; 572.805
• DOI: 10.1016/j.jmb.2018.01.005
• Languages: English
• ISSNs: 0022-2836

Abstract

Abstract: The molecular basis of polyspecificity of Mdr1p, a major drug/H + antiporter of Candida albicans, is not elucidated. We have probed the nature of the drug-binding pocket by performing systematic mutagenesis of the 12 transmembrane segments. Replacement of the 252 amino acid residues with alanine or glycine yielded 2/3 neutral mutations while 1/3 led to the complete or selective loss of resistance to drugs or substrates transported by the pump. Using the GlpT-based 3D–model of Mdr1p, we roughly categorized these critical residues depending on their type and localization, 1°/ main structural impact ("S" group), 2°/ exposure to the lipid interface ("L" group), 3°/ buried but not facing the main central pocket, inferred as critical for the overall H + /drug antiport mechanism ("M" group) and finally 4°/ buried and facing the main central pocket ("B" group). Among "B" category, 13 residues were essential for the large majority of drugs/substrates, while 5 residues were much substrate-specific, suggesting a role in governing p olyspecificity (P group). 3D superposition of the substrate-specific MFS Glut1 and XylE with the MDR substrate-polyspecific MdfA and Mdr1p revealed that the B group forms a common substrate interaction core while the P group is only found in the 2 MDR MFS transporters, distributed into 3 areas around the B core. This specific pattern has let us to propose that the structural basis for polyspecificity of MDR MFS transporters is the extended capacity brought by residues located at the periphery of a binding core to accomodate compounds differing in size and type. Graphical abstract: Unlabelled Image Highlights: Ala-scanning of the MFS MDR Candida Mdr1p reveals 84 residues critical for drug efflux. 18 face the central binding pocket with 13 forming a core-binding region, critical whatever the drug. Around them 5 residues are optionally critical, depending of the drug. A same pattern is observed in the MDR MdfA while non-MDR XylE and Glut1 only display a core-binding region. Such spatial organization may be the structural basis for the polyspecificity that characterizes MDR MFS.