Abstract:
:We report here the cloning, expression, and characterization of a dual-substrate, cAMP and cGMP, cyclic nucleotide phosphodiesterase (PDE) from mouse. This PDE contains the consensus sequence for a PDE catalytic domain, but shares <50% sequence identity with the catalytic domains of all other known PDEs and, therefore, represents a new PDE gene family, designated PDE10A. The cDNA for PDE10A is 3, 370 nt in length. It includes a full ORF, contains three in-frame stop codons upstream of the first methionine, and is predicted to encode a 779-aa enzyme. At the N terminus PDE10A has two GAF domains homologous to many signaling molecules, including PDE2, PDE5, and PDE6, which likely constitute a low-affinity binding site for cGMP. PDE10A hydrolyzes cAMP with a Km of 0.05 microM and cGMP with a Km of 3 microM. Although PDE10A has a lower Km for cAMP, the Vmax ratio (cGMP/cAMP) is 4.7. RNA distribution studies indicate that PDE10A is expressed at highest levels in testis and brain.
journal_name
Proc Natl Acad Sci U S Aauthors
Soderling SH,Bayuga SJ,Beavo JAdoi
10.1073/pnas.96.12.7071keywords:
subject
Has Abstractpub_date
1999-06-08 00:00:00pages
7071-6issue
12eissn
0027-8424issn
1091-6490journal_volume
96pub_type
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