ABCC7 p.Phe409Gly
| Predicted by SNAP2: | A: N (53%), C: N (53%), D: D (53%), E: N (57%), G: D (53%), H: N (72%), I: N (78%), K: N (61%), L: N (87%), M: N (82%), N: N (57%), P: N (53%), Q: N (66%), R: N (61%), S: N (66%), T: N (66%), V: N (72%), W: N (57%), Y: N (87%), |
| Predicted by PROVEAN: | A: N, C: N, D: N, E: N, G: N, H: N, I: N, K: N, L: N, M: N, N: N, P: N, Q: N, R: N, S: N, T: N, V: N, W: N, Y: N, |
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[hide] The two ATP binding sites of cystic fibrosis trans... J Gen Physiol. 2006 Oct;128(4):413-22. Epub 2006 Sep 11. Zhou Z, Wang X, Liu HY, Zou X, Li M, Hwang TC
The two ATP binding sites of cystic fibrosis transmembrane conductance regulator (CFTR) play distinct roles in gating kinetics and energetics.
J Gen Physiol. 2006 Oct;128(4):413-22. Epub 2006 Sep 11., [PMID:16966475]
Abstract [show]
Cystic fibrosis transmembrane conductance regulator (CFTR), a member of the ABC (ATP binding cassette) transporter family, is a chloride channel whose activity is controlled by protein kinase-dependent phosphorylation. Opening and closing (gating) of the phosphorylated CFTR is coupled to ATP binding and hydrolysis at CFTR's two nucleotide binding domains (NBD1 and NBD2). Recent studies present evidence that the open channel conformation reflects a head-to-tail dimerization of CFTR's two NBDs as seen in the NBDs of other ABC transporters (Vergani et al., 2005). Whether these two ATP binding sites play an equivalent role in the dynamics of NBD dimerization, and thus in gating CFTR channels, remains unsettled. Based on the crystal structures of NBDs, sequence alignment, and homology modeling, we have identified two critical aromatic amino acids (W401 in NBD1 and Y1219 in NBD2) that coordinate the adenine ring of the bound ATP. Conversion of the W401 residue to glycine (W401G) has little effect on the sensitivity of the opening rate to [ATP], but the same mutation at the Y1219 residue dramatically lowers the apparent affinity for ATP by >50-fold, suggesting distinct roles of these two ATP binding sites in channel opening. The W401G mutation, however, shortens the open time constant. Energetic analysis of our data suggests that the free energy of ATP binding at NBD1, but not at NBD2, contributes significantly to the energetics of the open state. This kinetic and energetic asymmetry of CFTR's two NBDs suggests an asymmetric motion of the NBDs during channel gating. Opening of the channel is initiated by ATP binding at the NBD2 site, whereas separation of the NBD dimer at the NBD1 site constitutes the rate-limiting step in channel closing.
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No. Sentence Comment
178 We converted all three aromatic amino acids, including W401, F409, and F430 to glycine in the E1371S background and examined current relaxations of the W401G/F409G/F430G/E1371S (or triple/E1371S).
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ABCC7 p.Phe409Gly 16966475:178:158
status: NEW[hide] Cystic fibrosis transmembrane conductance regulato... Sheng Li Xue Bao. 2007 Aug 25;59(4):431-42. Bompadre SG, Hwang TC
Cystic fibrosis transmembrane conductance regulator: a chloride channel gated by ATP binding and hydrolysis.
Sheng Li Xue Bao. 2007 Aug 25;59(4):431-42., 2007-08-25 [PMID:17700963]
Abstract [show]
The cystic fibrosis transmembrane conductance regulator (CFTR) is a chloride channel that belongs to the ATP-binding cassette (ABC) transporter superfamily. Defective function of CFTR is responsible for cystic fibrosis (CF), the most common lethal autosomal recessive disorder in Caucasian populations. The disease is manifested in defective chloride transport across the epithelial cells in various tissues. To date, more than 1400 different mutations have been identified as CF-associated. CFTR is regulated by phosphorylation in its regulatory (R) domain, and gated by ATP binding and hydrolysis at its two nucleotide-binding domains (NBD1 and NBD2). Recent studies reveal that the NBDs of CFTR may dimerize as observed in other ABC proteins. Upon dimerization of CFTR's two NBDs, in a head-to-tail configuration, the two ATP-binding pockets (ABP1 and ABP2) are formed by the canonical Walker A and B motifs from one NBD and the signature sequence from the partner NBD. Mutations of the amino acids that interact with ATP reveal that the two ABPs play distinct roles in controlling ATP-dependent gating of CFTR. It was proposed that binding of ATP to the ABP2, which is formed by the Walker A and B in NBD2 and the signature sequence in NBD1, is critical for catalyzing channel opening. While binding of ATP to the ABP1 alone may not increase the opening rate, it does contribute to the stabilization of the open channel conformation. Several disease-associated mutations of the CFTR channel are characterized by gating defects. Understanding how CFTR's two NBDs work together to gate the channel could provide considerable mechanistic information for future pharmacological studies, which could pave the way for tailored drug design for therapeutical interventions in CF.
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No. Sentence Comment
194 B: Representative current relaxation traces for E1371S, W401G/E1371S and W401G/ F409G/F430G/E1371S (or triple/E1371S).
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ABCC7 p.Phe409Gly 17700963:194:80
status: NEW