ABCB1 p.Arg905Cys
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PMID: 18708637
[PubMed]
Loo TW et al: "Processing mutations disrupt interactions between the nucleotide binding and transmembrane domains of P-glycoprotein and the cystic fibrosis transmembrane conductance regulator (CFTR)."
No.
Sentence
Comment
107
The locations of positions equivalent to cysteines S473C and R905C in the other half of P-gp (A266C/F1086C) are indicated.
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ABCB1 p.Arg905Cys 18708637:107:61
status: NEW
PMID: 17627029
[PubMed]
Zolnerciks JK et al: "Evidence for a Sav1866-like architecture for the human multidrug transporter P-glycoprotein."
No.
Sentence
Comment
54
Novel cysteine codons were introduced into pMDR-cys- by site-directed mutagenesis (QuikChange multisite; Stratagene, La Jolla, CA, USA) using the oligonucleotides L443C, 5Ј-GTCCAGCTGATGCAGCGCTGCTATGACCCCACAG-3Ј; S474C, 5Ј-CTACGGGAAATCATTGGCGTCGTGTGTCAGGA- ACCTGTATTG-3Ј; R905C, 5Ј-GCAATAGAAAACTTCTGTAC- Figure 1.
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ABCB1 p.Arg905Cys 17627029:54:295
status: NEW139 The residues in ICL4 and NBD1 predicted to be in close proximity were replaced individually and also in the following pairwise combinations; Leu443Cys with Ser909Cys (L443CϩS909C), and Ser474Cys with Arg905Cys (S474CϩR905C).
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ABCB1 p.Arg905Cys 17627029:139:206
status: NEW155 Each of the single cysteine substitution mutants L443C, S474C, R905C, and S909C retain significant levels of drug transport activity, as do the L443CϩS909C and S474CϩR905C double mutants (Fig. 3B, C).
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ABCB1 p.Arg905Cys 17627029:155:63
status: NEW169 B) Histogram of cell surface expression of P-glycoproteins L443C, S474C, R905C, S909C and double mutants L443CϩS909C and S474CϩR905C are shown as indicated.
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ABCB1 p.Arg905Cys 17627029:169:73
status: NEW180 Taken together with the results of the cross-linking, the simplest interpretation of these data is that L443C is in close proximity to S909C and that S474C is in close proximity to R905C in the tertiary structure of monomeric P-glycoprotein, entirely consistent with the hypothesis based on the crystal structure of Sav1866.
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ABCB1 p.Arg905Cys 17627029:180:181
status: NEW184 Repetition with the mutant P-glycoprotein with a cysteine pair at positions S474C and R905C showed no evidence of conformational change (Fig. 7B), providing a convenient negative control for non-specific effects of the added nucleotides.
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ABCB1 p.Arg905Cys 17627029:184:86
status: NEW207 Efflux activity of cysteine mutants wt Pgp-cys- L443C S909C L443CϩS909C S474C R905C S474CϩR905C E556Q Mock Mean % activity 100 100.8 100.7 99.9 100.6 99.5 96.9 101.2 8.6 0.0 (Ϯse) Ϯ 0.6 Ϯ 0.8 Ϯ 0.4 Ϯ 0.5 Ϯ 1.4 Ϯ1.7 Ϯ0.9 Ϯ1.2 Ϯ 11.9 Ϯ 8.9 n 6 6 2 2 4 2 4 2 6 4 The efflux activity of the mutants generated in this study is presented as a percentage of the drug efflux activity of wild-type P-glycoprotein (wt), as described in Materials and Methods.
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ABCB1 p.Arg905Cys 17627029:207:84
status: NEW212 SDS-PAGE and Western analyses of P-glycoproteins with novel cysteines introduced into NBD1 (L443C and S474C) and/or ICL4 of TMD2 (R905C and S909C), as indicated.
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ABCB1 p.Arg905Cys 17627029:212:130
status: NEW219 L443C P-glycoprotein was coexpressed in cells with S909C P-glycoprotein, and likewise S474C P-glycoprotein was coexpressed with R905C P-glycoprotein.
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ABCB1 p.Arg905Cys 17627029:219:128
status: NEW220 SDS-PAGE and Western analyses showed no evidence of intermolecular cross-linking (lack of a slow mobility P-glycoprotein species) between the L443C on one protein and S909C on another, or between S474C and R905C on different P-glycoproteins.
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ABCB1 p.Arg905Cys 17627029:220:206
status: NEW245 SDS-PAGE and Western analyses of P-glycoprotein double mutants with novel cysteines introduced at (A) L443C and S909C, or (B) S474C and R905C.
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ABCB1 p.Arg905Cys 17627029:245:136
status: NEW266 The differential response of the two cysteine pairs (cross-linking in the S474C and R905C double mutant appears insensitive to added nucleotide), suggests that S474 and R905 may move in tandem during the ATP catalytic cycle, if they move at all.
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ABCB1 p.Arg905Cys 17627029:266:84
status: NEW