ABCB1 p.Phe942Ala
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PMID: 10585407
[PubMed]
Loo TW et al: "Identification of residues in the drug-binding domain of human P-glycoprotein. Analysis of transmembrane segment 11 by cysteine-scanning mutagenesis and inhibition by dibromobimane."
No.
Sentence
Comment
79
Wild-type P-gp had an apparent affinity of 24 M verapamil, while mutants F942A, T945A, Q946A, A947L, and Y953A had decreased apparent affinities of 93, 100, 165, 156, and 110 M, respectively.
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ABCB1 p.Phe942Ala 10585407:79:81
status: NEW83 By contrast, mutants A954L and F942A had only 13 and 30%, respectively, of the wild-type activity.
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ABCB1 p.Phe942Ala 10585407:83:31
status: NEW100 There were, however, significant decreases in the activity for mutants Q946A (18%), F942A (24%), and F957A (32%).
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ABCB1 p.Phe942Ala 10585407:100:84
status: NEW128 TABLE I Drug-stimulated ATPase activity Mutant Drug Verapamil Vinblastine Colchicine Vmax Km Vmax Km Vmax Km % of WTa M % of WT M % of WT mM WT 100 24 100 5.4 100 0.62 I937S 94 22 93 6.1 100 0.69 F938A 106 32 96 5.1 96 0.68 G939V 62 8 45 4.0 165 0.26 I940S 93 32 93 5.6 93 0.65 T941A 100 25 104 5.5 100 0.66 F942A 88 93 30 5.1 24 0.80 S943A 92 26 100 5.2 85 0.62 F944A 93 14 105 5.3 101 0.64 T945A 140 100 165 8.3 56 0.65 Q946A 101 165 57 8.5 18 0.64 A947L 105 156 60 13.0 51 1.87 M948A 103 23 101 5.9 103 0.62 M949A 82 40 96 5.5 61 0.60 Y950A 109 37 119 5.1 99 0.62 F951A 94 31 99 5.2 101 0.64 S952A 108 36 123 5.1 91 0.69 Y953A 205 110 59 8.5 131 0.67 A954L 108 44 13 NDb 8 ND G955V 143 10 104 3.5 220 0.47 C956A 97 24 95 5.3 145 0.63 F957A 126 21 47 4.8 32 1.0 a WT, wild type. b ND, not determined due to low activity.
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ABCB1 p.Phe942Ala 10585407:128:324
status: NEW147 DISCUSSION Mutants G939V, F942A, T945A, Q946A, A947L, and Y953A in TM11 had altered apparent affinities for verapamil, vinblastine, or colchicine.
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ABCB1 p.Phe942Ala 10585407:147:26
status: NEW
PMID: 23104431
[PubMed]
Gozalpour E et al: "Interaction of digitalis-like compounds with p-glycoprotein."
No.
Sentence
Comment
46
However, transport activity was preserved in L65A, I306A, I340A, F942A, and V982A.
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ABCB1 p.Phe942Ala 23104431:46:65
status: NEW62 Ten different P-gp mutants were produced: L65A, I306A, F336A, I340A, F343A, F728A, F942A, T945A, L975A, and V982A and all mutations were confirmed by sequencing of full-length P-gp cDNA.
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ABCB1 p.Phe942Ala 23104431:62:83
status: NEW122 All the indicated amino acids were replaced by alanine to remove the side chain of the residue (L65A, I306A, F336A, I340A, F343A, F728A, F942A, T945A, L975A, and V982A).
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ABCB1 p.Phe942Ala 23104431:122:137
status: NEW132 NMQ transport activity of mutants L65A, F336A, I340A, F942A, andV982A as compared with wild-type P-gp ranged from 60 to 150%, whereas NMQ transport activity of I306A, F343A, F728A, T945A, and L975A varied between 8 and 30%.
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ABCB1 p.Phe942Ala 23104431:132:54
status: NEW135 In addition, five P-gp mutants (L65A, F336A, I340A, F942A, and V982A), for which NMQ transport activity was at least 50% of wild-type transport, were selected.
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ABCB1 p.Phe942Ala 23104431:135:52
status: NEW140 F942A seems to affect the digoxin binding (3.0), although not significantly.
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ABCB1 p.Phe942Ala 23104431:140:0
status: NEW180 Fig. 5.ߓ Western blot analysis (A) and NMQ transport activity of wild type and L65A, I306A, F336A, I340A, F343A, F728A, F942A, T945A, L975A, and V982A mutant P-gp (B).
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ABCB1 p.Phe942Ala 23104431:180:126
status: NEW202 NMQ transport activity of the second group mutants (L65A, F336A, I340A, F942A, and V982A) was not significantly different from that of the wild-type P-gp (60-150%).
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ABCB1 p.Phe942Ala 23104431:202:72
status: NEW208 Table 1 The IC50 Values of DLCs Against Wild-Type and Mutant P-gp-Mediated [3 H]-NMQ Transport P-gp Cymarin Digitoxin Digoxin Peruvoside Proscillaridin A Strophanthidol IC50 (&#b5;M) RIC50 IC50 (&#b5;M) RIC50 IC50 (&#b5;M) RIC50 IC50 (&#b5;M) RIC50 IC50 (&#b5;M) RIC50 IC50 (&#b5;M) RIC50 Wild type 432ߙ&#b1;ߙ90 9ߙ&#b1;ߙ2.1 188ߙ&#b1;ߙ24 214ߙ&#b1;ߙ41 25ߙ&#b1;ߙ3.5 242ߙ&#b1;ߙ61 L65A 800ߙ&#b1;ߙ99 1.9 17ߙ&#b1;ߙ3.4 1.9 217ߙ&#b1;ߙ33 1.2 469ߙ&#b1;ߙ73* 2.2 48ߙ&#b1;ߙ7.2 1.9 186ߙ&#b1;ߙ18 0.8 F336A 979ߙ&#b1;ߙ48 2.3 14ߙ&#b1;ߙ1.9 1.6 524ߙ&#b1;ߙ114 2.8 528ߙ&#b1;ߙ92** 2.5 111ߙ&#b1;ߙ19** 4.4 291ߙ&#b1;ߙ45 1.2 I340A 1181ߙ&#b1;ߙ103** 2.7 19ߙ&#b1;ߙ4.3 2.0 439ߙ&#b1;ߙ138 2.3 527ߙ&#b1;ߙ37** 2.5 79ߙ&#b1;ߙ21* 3.1 156ߙ&#b1;ߙ14 0.6 F942A 821ߙ&#b1;ߙ256 1.9 8ߙ&#b1;ߙ1.0 0.9 558ߙ&#b1;ߙ145 3.0 273ߙ&#b1;ߙ29 1.3 18ߙ&#b1;ߙ1 0.7 187ߙ&#b1;ߙ24 0.8 V982A 620ߙ&#b1;ߙ106 1.4 12ߙ&#b1;ߙ2.1 1.3 345ߙ&#b1;ߙ73 1.8 291ߙ&#b1;ߙ10 1.4 22ߙ&#b1;ߙ3.4 0.9 144ߙ&#b1;ߙ9 0.6 Note.
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ABCB1 p.Phe942Ala 23104431:208:1000
status: NEW213 Inhibition of NMQ transport by L65A, F942A, and V982A with six DLCs showed that in only one case the mutation caused a significant difference in the IC50 value (ratio of 2.2) of the DLCs compared with wild-type P-gp.
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ABCB1 p.Phe942Ala 23104431:213:37
status: NEW
No.
Sentence
Comment
56
Nine different P-gp mutants, I306A, F336A, I340A, F343A, F728A, F942A, T945A, L975A, and V982A, were produced and sequencing of full-length P-gp cDNA was used to confirm all mutations (Gozalpour et al., 2013).
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ABCB1 p.Phe942Ala 25264938:56:64
status: NEW154 Nine amino acids were replaced by alanine (I306A, F336A, I340A, F343A, F728A, F942A, T945A, L975A, and V982A) and P-gp mutants were expressed in HEK293 cells to produce membrane vesicles.
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ABCB1 p.Phe942Ala 25264938:154:78
status: NEW168 The transport activity of F336A, F942A, T945A and L975A for NMQ ranged from 49% to 57%, whereas I340A showed increased activity of 120% and V982A had about the same activity as wild type (Fig. 5B).
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ABCB1 p.Phe942Ala 25264938:168:33
status: NEW170 Convallatoxin and NMQ transport activity were not significantly different for I306A, F336A, I340A, F728A, F942A, T945A, and L975A (Fig. 5C), whereas they differed significantly for F343A and V982A (Fig. 5D and E).
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ABCB1 p.Phe942Ala 25264938:170:106
status: NEW254 The transport activity of F336A, F942A, T945A, L975A and V982A, were conserved (45-100% of wild type) (Fig. 5B) similar to our previous results (Gozalpour et al., 2013).
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ABCB1 p.Phe942Ala 25264938:254:33
status: NEW255 Convallatoxin transport activity of most mutants (I306A, F336A, I340A, F728A, F942A, T945, and L975) was similar to that of NMQ.
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ABCB1 p.Phe942Ala 25264938:255:78
status: NEW