The complete amino acid sequence of an invertebrate calcium channel al
pha-subunit from housefly (Musca domestica) larvae (designated Mdl alp
ha(1)) has been deduced by cDNA cloning and sequence analysis. Mdbl al
pha(1) shares higher percent sequence identity with 1,4-dihydropyridin
e (DHP)-sensitive L-type than with DHP-insensitive calcium channels. A
s shown by whole mount in situ hybridization and immunostaining Mdl al
pha(1) is predominantly expressed in the larval body wall musculature.