ANT OPSINS - SEQUENCES FROM THE SAHARAN SILVER ANT AND THE CARPENTER ANT

cDNA clones encoding opsins from compound eyes oi carpenter ant, Campo notus abdominalis, and Saharan silver ant, Cataglyphis bombycina, were isolated from cDNA libraries. The opsin cDNAs from each species code for deduced proteins with 378 amino acids which are 99% identical. Of the 30 amino acid differences between the two proteins, 13 are non-con servative. Eight oi these non-conservative substitutions are within th e membrane spanning domain. The presence of a potential Schiff-base co unterion in helix III in both species suggests that these opsins are t he protein moiety oi the visible range pigments. When compared to all known opsins, these opsins are most similar to the opsin from preying mantis (76% identity at the amino acid level). Phyletic comparisons gr oup the two ant opsins with the other arthropod long wavelength opsins .