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Multiplicity in type V adenylylcyclase: type V-a and type V-b
1Department of Medicine, College of Physicians and Surgeons of Columbia University, New York, NY 10032, USA.
Molecular and Cellular Endocrinology
|April 28, 1995
Summary
Multiple splicing variants of type V mammalian adenylylcyclase (ACV) are generated from a single gene in dogs and rats. These variants, despite differing N-terminal sequences, exhibit similar biochemical properties.
Area of Science:
- Molecular Biology
- Biochemistry
- Genetics
Background:
- Type V mammalian adenylylcyclase (ACV) cDNA was initially identified in dogs and rats.
- Amino acid sequences of ACV from these species show high homology, except for the N-terminal cytoplasmic region.
Purpose of the Study:
- To investigate the expression and genetic origin of different ACV forms.
- To determine if distinct N-terminal sequences of ACV variants affect biochemical properties.
Main Methods:
- Northern blot analysis using species-specific oligonucleotide probes to detect mRNA variants.
- Genomic Southern blot analysis to infer the gene structure.
- Overexpression studies to assess the impact of N-terminal domain deletion on biochemical activity.
Main Results:
- Two ACV mRNA splicing variants, canine (ACV-a) and rat (ACV-b), are co-expressed in both species.
- Genomic analysis suggests both variants originate from a single ACV gene.
- Deletion of the N-terminal domain did not alter the biochemical properties of the overexpressed enzyme.
Conclusions:
- A single gene can produce multiple ACV splicing variants with unique N-terminal amino acid sequences.
- These distinct N-terminal regions do not appear to influence the fundamental biochemical properties of ACV.