Two Types of cDNAs Encoding Proopiomelanocortin of Sockeye Salmon, Oncorhynchus nerka
スポンサーリンク
概要
- 論文の詳細を見る
To investigate regulatory mechanisms of proopiomelanocortin (POMC) gene expression in sockeye salmon, we have isolated and characterized cDNAs encoding two types of sockeye salmon POMC, which are referred to as ssPOMC-A and -B. Two types of PCR products were amplified from total RNA of sockeye salmon pituitaries by use of rainbow trout sequences. Full length cDNA clones encoding ssPOMC-A and ssPOMC-B were obtained from a pituitary cDNA library of sockeye salmon using the PCR products as probes. The ssPOMC-A and -B cDNAs have a length of 1072 and 1709 bps, respectively. Northern blot analysis showed that both ssPOMC-A and -B mRNAs were expressed only in the pituitary, and their sizes were about 1.2 kb and 1.8 kb, respectively. The presence of two ssPOMC genes was confirmed by Southern blot analysis of genomic DNA obtained from a single sockeye salmon. The deduced amino acid sequences of the ssPOMC-A and -B contained 230 and 226 residues, respectively. The amino terminal of β-endorphin in ssPOMC-B which corresponds to Met-enkephalin domain is YSGFM, which is different from YGGFM of Met-enkephalin found in many other vertebrate species. The homology of nucleotide sequences between ssPOMC-A and -B is 59% in the entire coding region, whereas α-MSH coding regions are highly homologous (91%). Although the deduced amino acid sequences of ssPOMCs show 43% overall similarity, their hydropathy profiles are coincident with those of several other vertebrate species, particularly the amino terminal of N-terminal peptide (NPP) shows almost the same pattern with other vertebrate NPPs.
- 社団法人日本動物学会の論文
- 1996-06-15
著者
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Okuta Akiko
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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Ueda H
Field Science Center For Northern Biosphere Hokkaido University
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Ando Hironori
Division Of Biological Sciences Graduate School Of Science Hokkaido University
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UEDA Hiroshi
Toya Lake Station for Environmental Biology, Faculty of Fisheries, Hokkaido University
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Urano Akihisa
Field Science Center For Northern Biosphere Hokkaido University
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Urano Akihisa
Division Of Biological Science Graduate School Of Life Science Hokkaido University
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Ueda H
Field Sci. Ctr. Hokkaido Univ.
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Ueda Hiroshi
Department Of Dermatology Fujita Health University School Of Medicine
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Ueda H
Usa Marine Biological Institute Kochi University
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Ueda Hiroshi
Toya Lake Station For Environmental Biology Faculty Of Fisheries Hokkaido University
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