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Identification and tissue-specific expression of PDE7 phosphodiesterase splice variants.

Proc. Natl. Acad. Sci. U.S.A.1996 Nov 26;93(24):14188-92. doi:10.1073/pnas.93.24.14188
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摘要


Type 7 cyclic nucleotide phosphodiesterases (PDE7s) are a newly described family of enzymes having high affinity and specificity for cAMP. However, little is known about their structure, function, or regulation. We have isolated a mouse skeletal muscle cDNA representing a new alternative splice variant (PDE7A2) of the PDE7 gene. The ORF encodes a 456-amino acid protein having a predicted molecular weight of 52.4 kDa. The 5' end of the mouse PDE7A2 is divergent from the 5' end of the human PDE7A1 sequence and is more hydrophobic. A comparison of the 5' ends of the two cDNA clones with human genomic sequence indicates that they represent alternate splice products rather than species variation. RNase protection analysis of several mouse tissues indicates that PDE7 is expressed widely with highest levels in skeletal muscle. HPLC fractionation and Western blot analysis of two human lymphocyte T-cell lines shows that an unknown PDE activity described by Ichimura and Kase [Ichimura, M. & Kase, H. (1993) Biochem. Biophys. Res. Commun. 193, 985-990] is most likely to be PDE7A1. A single immunoreactive band of approximately 55 kDa, which comigrates with PDE7A1, is seen in fractions of the HPLC profile containing this activity suggesting that the original human PDE7A1 clone contains a full-length ORF, and is not truncated at the 5' end as was originally postulated. In a human lymphocyte B-cell line and also in mouse skeletal muscle, a large amount of PDE7 mRNA but little PDE7 protein or activity is expressed suggesting that the translation or stability of PDE7 protein may be highly regulated in these tissues.

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