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• W1596316759 abstract "Oligonucleotide-directed mutagenesis was used to generate mutations in the a subunit gene (uncB) altering the glutamic acid 219 and the histidine 245 codons. Substitutions of aspartic acid, glutamine, histidine, and leucine for glutamic acid at position 219 neither alter the hydrolytic activity of membrane-bound F1 nor the association of F1 with F0. However, the efficiency of F0-mediated proton translocation was reduced to varying degrees. Replacement of glutamic acid 219 with leucine reduced the ATP-driven proton pumping activity of intact F1F0 to undetectable levels. Roughly 5% of normal activity was observed when glutamine occupied position 219. Surprisingly higher activity, approaching 20% of wild type levels, is seen when histidine replaced glutamic acid 219. The aspartic acid substitution resulted in little loss of enzyme function. Substitution of glutamic acid for histidine 245 results in a reduction to about 45% of normal proton translocation. Construction of the double mutant with substitution of histidine at position 219 and glutamic acid at position 245 yields a complex with better proton translocation than with either mutant separately. The possibility that a functionally important interaction between histidine 245 and glutamic acid 219 of the a subunit may be directly involved in the proton translocation mechanism of F1F0-ATP synthase is discussed." @default.
• W1596316759 created "2016-06-24" @default.
• W1596316759 creator A5049123733 @default.
• W1596316759 creator A5052722206 @default.
• W1596316759 date "1988-05-01" @default.
• W1596316759 modified "2023-10-16" @default.
• W1596316759 title "Interaction between Glu-219 and His-245 within the a subunit of F1F0-ATPase in Escherichia coli." @default.
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• W1596316759 doi "https://doi.org/10.1016/s0021-9258(18)68684-3" @default.
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