Abstract:
:A novel cDNA encoding alpha subunit of the GTP-binding protein, transducin, has been cloned from a marine fish, Sparus aurata. The cDNA contains an open reading frame of 1050 nt (encoding 350 amino acid residues). A high degree of identity was found with known mammalian transducin proteins of cones (Gt2 alpha) or rods (Gt1 alpha): human Gt2 alpha (80.2%), bovine Gt2 alpha (79.3%), mouse Tt1 alpha (78.2%), mouse Gt2 alpha (78%) and bovine Gt1 alpha (77.9%). Northern blot analysis of different tissues revealed a transcript of about 2.5 kb, which is expressed only in the fish eye and not in other tissues from adult fish, supporting its identification as transducin. Ontogeny of transducin mRNA expression during early development of Sparus aurata, determined by Northern blot analysis, showed very low levels in larvae 3 days after hatching but not earlier. Levels increased 3- and 6-fold on days 4 and 6 (respectively) compared with those on day 3 and remained essentially unchanged thereafter, until day 21 after hatching (the last day studied). Our results suggest that in fish only one alpha subunit of transducin is found, which shows similar identity with cone and rod alpha subunits of mammals.
journal_name
Vision Resjournal_title
Vision researchauthors
Funkenstein B,Jakowlew SBdoi
10.1016/s0042-6989(97)00062-xsubject
Has Abstractpub_date
1997-09-01 00:00:00pages
2487-93issue
18eissn
0042-6989issn
1878-5646pii
S0042-6989(97)00062-Xjournal_volume
37pub_type
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