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Molecular Pharmacology

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Abstract

Solution-phase library screening for the identification of rare clones: isolation of an alpha 1D-adrenergic receptor cDNA.

D M Perez, M T Piascik and R M Graham
Molecular Pharmacology December 1991, 40 (6) 876-883;
D M Perez
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M T Piascik
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R M Graham
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Abstract

alpha 1-Adrenergic receptor (alpha 1-AR) subtypes (alpha 1A and alpha 1B) play a critical role in vascular smooth muscle contraction and circulatory homeostasis. Transcripts for these guanine nucleotide-binding protein-coupled receptors are extremely low in abundance, however, and isolation of their cDNAs is difficult. We have developed a novel technique for identifying rare clones in a cDNA library, which has been used successfully to isolate a cDNA clone encoding an alpha 1D-AR. A 564-bp polymerase chain reaction product encoding a region between the third and sixth transmembrane domains of the alpha 1D-AR was first generated using rat brain mRNA as template and highly degenerate primers. The primers corresponded to those domains but contained mismatches to the alpha 1B-AR sequences. A 3-kb transcript was identified with this polymerase chain reaction probe, by Northern analysis of rat hippocampus. However, traditional plaque hybridization failed to identify a cDNA in a rat hippocampus lambda gt10 library. By solution-phase screening of virtually the entire library, a cDNA containing a 3-kb insert was identified, amplified, and purified. This insert encodes a 560-amino acid protein corresponding to the topology of guanine nucleotide-binding protein-coupled receptors. This receptor has approximately 71% amino acid identity, in the transmembrane regions, to the hamster and rat alpha 1B-ARs. Characterization of the receptor expressed in COS-7 cells, by ligand binding and photoaffinity labeling, revealed some of the characteristics of an alpha 1A-AR. However, unlike alpha 1A-ARs characterized previously in membrane preparations or in solubilized partially purified preparations, the expressed receptor could be extensively inactivated by chlorethylclonidine. In addition, it displays ligand-binding properties that are not consistent with an alpha 1A-AR. This indicates that the cDNA clone that we have isolated encodes a novel alpha 1-AR subtype, which we classify as the alpha 1D-AR.

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Molecular Pharmacology
Vol. 40, Issue 6
1 Dec 1991
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Abstract

Solution-phase library screening for the identification of rare clones: isolation of an alpha 1D-adrenergic receptor cDNA.

D M Perez, M T Piascik and R M Graham
Molecular Pharmacology December 1, 1991, 40 (6) 876-883;

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Abstract

Solution-phase library screening for the identification of rare clones: isolation of an alpha 1D-adrenergic receptor cDNA.

D M Perez, M T Piascik and R M Graham
Molecular Pharmacology December 1, 1991, 40 (6) 876-883;
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