Abstract:
:An analysis of Candida albicans ABC transporters identified conserved related α-helical sequence motifs immediately C-terminal of each Walker A sequence. Despite the occurrence of these motifs in ABC subfamilies of other yeasts and higher eukaryotes, their roles in protein function remained unexplored. In this study we have examined the functional significance of these motifs in the C. albicans PDR transporter Cdr1p. The motifs present in NBD1 and NBD2 were subjected to alanine scanning mutagenesis, deletion, or replacement of an entire motif. Systematic replacement of individual motif residues with alanine did not affect the function of Cdr1p but deletion of the M1-motif in NBD1 (M1-Del) resulted in Cdr1p being trapped within the endoplasmic reticulum. In contrast, deletion of the M2-motif in NBD2 (M2-Del) yielded a non-functional protein with normal plasma membrane localization. Replacement of the motif in M1-Del with six alanines (M1-Ala) significantly improved localization of the protein and partially restored function. Conversely, replacement of the motif in M2-Del with six alanines (M2-Ala) did not reverse the phenotype and susceptibility to antifungal substrates of Cdr1p was unchanged. Together, the M1 and M2 motifs contribute to the functional asymmetry of NBDs and are important for maturation of Cdr1p and ATP catalysis, respectively.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Rawal MK,Banerjee A,Shah AH,Khan MF,Sen S,Saxena AK,Monk BC,Cannon RD,Bhatnagar R,Mondal AK,Prasad Rdoi
10.1038/srep27132subject
Has Abstractpub_date
2016-06-02 00:00:00pages
27132issn
2045-2322pii
srep27132journal_volume
6pub_type
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