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XB-ART-20795
J Biol Chem 1994 Sep 23;26938:23668-74.
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Cloning and functional expression of a neuronal calcium channel beta subunit from house fly (Musca domestica).

Grabner M, Wang Z, Mitterdorfer J, Rosenthal F, Charnet P, Savchenko A, Hering S, Ren D, Hall LM, Glossmann H.


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The primary structure of a calcium channel beta subunit (beta M) from housefly (Musca domestica) has been deduced by cDNA cloning and sequence analysis. The open reading frame encodes a 441-amino acid polypeptide with a calculated molecular mass of 48,755 Da. Whole-mount in situ hybridization indicates that beta M mRNA is predominantly expressed in neuronal tissues. Transcription of beta M mRNA is evident from stage 13/14 of embryogenesis up to adulthood. Different expression patterns of splice variants were found in larvae and in adult fly heads. Amino acid identity between beta M and mammalian beta subunits is lower (66-68%) than within mammalian beta subunits (74-80%). Calculation of a phylogenetic tree indicates that beta M is an ancestral form of the four distinct beta subunit gene products identified in mammalian tissues so far. Despite these sequence differences, beta M is able to enhance endogenous calcium channel activity in Xenopus laevis oocytes as well as dihydropyridine binding to membranes from COS 7 cells transfected with rabbit heart alpha 1 cDNA in the same manner as was previously shown for mammalian beta subunits.

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???displayArticle.link??? J Biol Chem