ABCC7 p.Val318Ala
| Predicted by SNAP2: | A: N (53%), C: N (57%), D: D (80%), E: D (71%), F: D (75%), G: D (75%), H: D (75%), I: N (87%), K: D (71%), L: N (61%), M: N (66%), N: D (66%), P: D (75%), Q: D (71%), R: D (80%), S: D (59%), T: N (78%), W: D (85%), Y: D (75%), |
| Predicted by PROVEAN: | A: N, C: N, D: D, E: N, F: N, G: N, H: D, I: N, K: N, L: N, M: N, N: N, P: N, Q: N, R: D, S: N, T: N, W: D, Y: N, |
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[hide] Direct comparison of the functional roles played b... J Biol Chem. 2004 Dec 31;279(53):55283-9. Epub 2004 Oct 25. Ge N, Muise CN, Gong X, Linsdell P
Direct comparison of the functional roles played by different transmembrane regions in the cystic fibrosis transmembrane conductance regulator chloride channel pore.
J Biol Chem. 2004 Dec 31;279(53):55283-9. Epub 2004 Oct 25., 2004-12-31 [PMID:15504721]
Abstract [show]
The cystic fibrosis transmembrane conductance regulator (CFTR) Cl(-) channel contains 12 transmembrane (TM) regions that are presumed to form the channel pore. However, little is known about the relative functional contribution of different TM regions to the pore. We have used patch clamp recording to investigate the functional consequences of point mutations throughout the six transmembrane regions in the N-terminal part of the CFTR protein (TM1-TM6). A range of specific functional assays compared the single channel conductance, anion binding, and anion selectivity properties of different channel variants. Overall, our results suggest that TM1 and -6 play dominant roles in forming the channel pore and determining its functional properties, with TM5 perhaps playing a lesser role. In contrast, TM2, -3, and -4 appear to play only minor supporting roles. These results define transmembrane regions 1 and 6 as major contributors to the CFTR channel pore and have strong implications for emerging structural models of CFTR and related ATP-binding cassette proteins.
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No. Sentence Comment
77 Significant, but smaller, reductions in unitary conductance were observed in G213A, V318A, S321A, V322A, K335A, and I336A (Figs. 3 and 4).
X
ABCC7 p.Val318Ala 15504721:77:84
status: NEW119 Some mutants that significantly affect both unitary conductance and Au(CN)2 - block were found to be without effect on SCN- permeability (Q98A, V318A, R334K, K335A).
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ABCC7 p.Val318Ala 15504721:119:144
status: NEW