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• W2111151262 abstract "The amino acid sequences of all known cGMP-binding phosphodiesterases (PDEs) contain internally homologous repeats (a and b) that are 80-90 residues in length and are arranged in tandem within the putative cGMP-binding domains. In the bovine lung cGMP-binding, cGMP-specific PDE (cGB-PDE or PDE5A), these repeats span residues 228-311 (a) and 410-500 (b). An aspartic acid (residue 289 or 478) that is invariant in repeats a and b of all known cGMP-binding PDEs was changed to alanine by site-directed mutagenesis of cGB-PDE, and wild type (WT) and mutant cGB-PDEs were expressed in COS-7 cells. Purified bovine lung cGB-PDE (native) and WT cGB-PDE displayed identical cGMP-binding kinetics, with ~1.8 μM cGMP required for half-maximal saturation. The D289A mutant showed decreased affinity for cGMP (Kd > 10 μM) and the D478A mutant showed increased affinity for cGMP (Kd≈ 0.5 μM) as compared to WT and native cGB-PDE. WT and native cGB-PDE displayed an identical curvilinear profile of cGMP dissociation which was consistent with the presence of distinct slowly dissociating (koff = 0.26 h−1) and rapidly dissociating (koff = 1.00 h−1) sites of cGMP binding. In contrast, the D289A mutant displayed a single koff = 1.24 h−1, which was similar to the calculated koff for the fast site of WT and native cGB-PDE, and the D478A mutant displayed a single koff = 0.29 h−1, which was similar to that calculated for the slow site of WT and native cGB-PDE. These results were consistent with the loss of a slow cGMP-binding site in repeat a of the D289A mutant cGB-PDE, and the loss of a fast site in repeat b of the D478A mutant, suggesting that cGB-PDE possesses two distinct cGMP-binding sites located at repeats a and b, with the invariant aspartic acid being crucial for interaction with cGMP at each site. The amino acid sequences of all known cGMP-binding phosphodiesterases (PDEs) contain internally homologous repeats (a and b) that are 80-90 residues in length and are arranged in tandem within the putative cGMP-binding domains. In the bovine lung cGMP-binding, cGMP-specific PDE (cGB-PDE or PDE5A), these repeats span residues 228-311 (a) and 410-500 (b). An aspartic acid (residue 289 or 478) that is invariant in repeats a and b of all known cGMP-binding PDEs was changed to alanine by site-directed mutagenesis of cGB-PDE, and wild type (WT) and mutant cGB-PDEs were expressed in COS-7 cells. Purified bovine lung cGB-PDE (native) and WT cGB-PDE displayed identical cGMP-binding kinetics, with ~1.8 μM cGMP required for half-maximal saturation. The D289A mutant showed decreased affinity for cGMP (Kd > 10 μM) and the D478A mutant showed increased affinity for cGMP (Kd≈ 0.5 μM) as compared to WT and native cGB-PDE. WT and native cGB-PDE displayed an identical curvilinear profile of cGMP dissociation which was consistent with the presence of distinct slowly dissociating (koff = 0.26 h−1) and rapidly dissociating (koff = 1.00 h−1) sites of cGMP binding. In contrast, the D289A mutant displayed a single koff = 1.24 h−1, which was similar to the calculated koff for the fast site of WT and native cGB-PDE, and the D478A mutant displayed a single koff = 0.29 h−1, which was similar to that calculated for the slow site of WT and native cGB-PDE. These results were consistent with the loss of a slow cGMP-binding site in repeat a of the D289A mutant cGB-PDE, and the loss of a fast site in repeat b of the D478A mutant, suggesting that cGB-PDE possesses two distinct cGMP-binding sites located at repeats a and b, with the invariant aspartic acid being crucial for interaction with cGMP at each site." @default.
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• W2111151262 date "1995-12-01" @default.
• W2111151262 modified "2023-09-27" @default.
• W2111151262 title "An Essential Aspartic Acid at Each of Two Allosteric cGMP-binding Sites of a cGMP-specific Phosphodiesterase" @default.
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• W2111151262 doi "https://doi.org/10.1074/jbc.270.51.30671" @default.
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