[No authors listed]
A cDNA clone corresponding to the entire coding region of the bovine ETB endothelin receptor mRNA was isolated from a lung cDNA library and sequenced. The cDNA encodes 441 amino acids: 26 constituting an NH2-terminal signal peptide and 415 constituting the mature receptor. The signal peptidase cleavage site was determined by direct amino acid sequencing of purified receptor. A comparison of the predicted amino acid sequence with the available bovine ETA and rat ETB endothelin receptor sequences revealed 63 and 85% homology, respectively. Endothelin receptors of various species are known to be very sensitive to a certain metal proteinase(s) and have been shown to be converted to a lower Mr form in the absence of EDTA. The metal proteinase cleavage site was also determined by direct protein sequencing of the proteolysis product. The amino acid sequence (Ala-Gly-X-Pro-Pro-Arg) surrounding the cleavage site (between Ala-79 and Gly-80) is conserved among the ETB endothelin receptors, explaining the above mentioned proteolytic conversion from the higher to lower Mr forms observed in various species.
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