Nucleotide and deduced amino acid sequence of equine retinal and pineal gland phosducin.
OBJECTIVE
To determine the full-length complementary DNA (cDNA) sequence of equine retinal and pineal gland phosducin (PHD) and to clone these sequences.


METHODS
Samples of equine retinal RNA.


METHODS
A primer set was designed for use in identifying a fragment of the equine PHD nucleotide sequence, derived from retinal RNA samples, and subsequently for use to deduce specific primers for additional examination. The full-length cDNA was determined by the method of rapid amplification of cDNA ends (RACE). For full-length cDNA, newly designed primers were used. Nucleotide sequences were analyzed by use of computer software. The deduced amino acid sequence was compared with sequences of PHD reported for other species. In addition, the sequence of equine pineal PHD was cloned.


RESULTS
The cDNA nucleotide sequence for equine PHD was 1,209 base pairs (bp) in length with an open-reading frame encoding a protein of 245 amino acids and a calculated molecular mass of 28.214 kd. Similarity with amino acid sequences of PHD from other species was 89 to 93%. Sequences of equine PHD from retina and pineal gland were identical. Equine PHD contained a peptide sequence with 100% homology to an uveitopathogenic peptide reported for rat PHD.


CONCLUSIONS
Equine PHD is a highly conserved protein that has homology of immunologic interest with rat PHD. These results establish a basis for studying the role of PHD in ocular inflammation of horses.
Keller
C
C
Institute of Pharmacology, Toxicology, and Pharmacy, University of Munich, Germany.
Schulz
R
R
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D018076:DNA, Complementary; D005136:Eye Proteins / Q000737:chemistry* / Q000235:genetics*; D020555:GTP-Binding Protein Regulators; D006736:Horses; D006801:Humans; D008322:Mammals; D008969:Molecular Sequence Data; D010750:Phosphoproteins / Q000737:chemistry* / Q000235:genetics*; D010870:Pineal Gland / Q000737:chemistry / Q000502:physiology*; D012160:Retina / Q000737:chemistry / Q000502:physiology*; D012172:Retinaldehyde / Q000737:chemistry* / Q000235:genetics*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
D018076:DNA, Complementary; D005136:Eye Proteins; D020555:GTP-Binding Protein Regulators; D010750:Phosphoproteins; C065631:phosducin; D012172:Retinaldehyde