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http://dx.doi.org/10.5352/JLS.2003.13.6.805

Characterization of Somatolactin cDNA from Rock Bream (Oplegnathus fasciatus)  

강현실 (제주대학교 해양과학대학 해양생물공학과)
여인규 (제주대학교 해양과학대학 해양생물공학과)
이제희 (제주대학교 해양과학대학 해양생물공학과)
Publication Information
Journal of Life Science / v.13, no.6, 2003 , pp. 805-813 More about this Journal
Abstract
cDNA encoding somatolactin (SL) was obtained by RT-PCR from pituitary glands of rock bream (Oplegnathus fasciatus). The full length cDNA of rock bream somatolactin (rbSL) is 1636 bp long. It contains a 696 bp open reading frame encoding a signal peptide of 24 amino acids (an) and a mature protein of 207 aa. rbSL has seven cysteine residues$(Cys^{5},\; Cys^{15},\; Cys^{42},\; Cys^{65},\; Cys^{181},\; Cys^{198}\; $and $Cys^{206})$ and two potential N-glycosylation sites at positions $Asn^{121}$and $Asn^{153}$. The rbSL shares 61.1∼92.6% amino acid sequence similarities and 63∼92.6% nucleotide sequence identities with other teleost SLs, except for goldfish and channel catfish SL. Amino acid sequence alignment revealed that rbSL has four conserved domains $(A_{SL},\; B_{SL},\; C_{SL}and\; D_{SL})$ common to all SLs. Out of these domains, $(A_{SL},\; B_{SL},\; C_{SL}and\; D_{SL})$, are also conserved in all teleost growth hormones and prolactins. The cDNA of rbSL has been cloned into pET expression vector in order to produce recombinant rbSL in E. coli BL2l(DE3) cells. The recombinant protein showed a molecular weight of 27 kDa in SDS-PAGE.
Keywords
Rock bream; Oplegnathus fasciatus; somatolactin; cDNA; cloning;
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