title: cDNA sequence and tissues expression analysis of lipoprotein lipase from common carp (Cyprinus carpio Var. Jian).
abstract: A full-length cDNA coding lipoprotein lipase (LPL) was cloned from liver of adult common carp (Cyprinus carpio Var. Jian) by RT-PCR and rapid amplification of cDNA ends (RACE) approaches. The cDNA obtained was 2,411 bp long with a 1,524 bp open reading frame (ORF) encoding 507 amino acids. This amino acid sequence contains two structural regions: N-terminus (24-354 residues) and C-terminus (355-507 residues). Before N-terminus, 1-23 residues is signal peptide, 6-23 residues is transmembrance helix. At N-terminus, some conversed functional sites were found, including two N-linked glycosylation sites Asn(41) and Asn(88); one catalytic triad Ser(174), Asp(198) and His(283); one conserved heparin-binding site Arg(321) to Arg(324) (RKNR); eight cysteines residues Cys(69) and Cys(82), Cys(258) and Cys(281), Cys(306) and Cys(325), Cys(317) and Cys(320) which are involved in four disulfide bridges; one polypeptide "lid" that participates in substrate specificity. At C-terminus, Asn(401) is another N-linked glycosylation site, and Trp(434) and Trp(435) (WW) is lipid-binding site. The amino acid sequence has a high similarity, and shows similar structural features to LPL of other species. Tissue distribution of LPL mRNA in liver, head kidney, mesenteric adipose tissue, heart and white muscle of common carp was analyzed by semi-quantitative RT-PCR method using beta-actin gene as internal control. The result showed that the expressions of LPL mRNA were detected in all examined tissues of common carp. The expression levels of LPL in the mesenteric adipose tissue was highest among these tissues, following in liver and head kidney, and the lowest expression was found in heart and white muscle.
authors.affiliation: College of Marine Science, Huaihai Institute of Technology, No. 59 Cangwu Road, 222005 Lianyungang, People's Republic of China. CHL3139@163.com
authors.forename: Han-liang
authors.initials: HL
authors.lastname: Cheng
authors.forename: Si-ping
authors.initials: SP
authors.lastname: Sun
authors.forename: Yong-xing
authors.initials: YX
authors.lastname: Peng
authors.forename: Xiao-yun
authors.initials: XY
authors.lastname: Shi
authors.forename: Xin
authors.initials: X
authors.lastname: Shen
authors.forename: Xue-ping
authors.initials: XP
authors.lastname: Meng
authors.forename: Zhi-guo
authors.initials: ZG
authors.lastname: Dong
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002347:Carps / Q000235:genetics*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics*; D020869:Gene Expression Profiling; D015971:Gene Expression Regulation, Enzymologic; D008071:Lipoprotein Lipase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008969:Molecular Sequence Data; D010802:Phylogeny; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D016415:Sequence Alignment
chemical_list: D018076:DNA, Complementary; D012333:RNA, Messenger; D008071:Lipoprotein Lipase