title: Molecular characterization, expression and mapping of porcine LMP2 and MECL-1 genes.
abstract: Low molecular mass polypeptides 2 (LMP2) and Multicatalytic endopeptidase complex subunit (MECL-1) are two of three catalytic beta-type subunits of the 20s proteasome and upon interferon gamma-induction. LMP2 is critical for the production of major histocompatibility complex (MHC) class I ligand and T-lymphocytes. The LMP2 gene is located in the MHC region, but MECL-1 is located outside the MHC region. They are involved in the antigen presentation and are important candidate genes for an initial exploration of relationships between the antigen processing genes and disease resistance. In this report, the porcine LMP2 and MECL-1 cDNA were cloned and A 5099 bp LMP2 genomic DNA structure was identified, then two single nucleotide polymorphisms were detected in the exon2 and exon5 of LMP2 gene in 367 individuals. The LMP2 and MECL-1 genes putative protein included 219,274 amino acids, respectively. Alignment and phylogenetic of predicted porcine LMP2 and MECL-1 amino acid sequence with their homologies were analyzed. Tissues expression of LMP2 and MECL-1 mRNA were observed by real time quantitative PCR (Q-PCR) method, the results revealed MECL-1 expressed widely in all tissues, but LMP2 was not detected in muscle. The porcine MECL-1 gene was mapped to chromosome 6, closely linked to microsatellite SW1108 (LOD = 4.09, 84cR) by radiation hybrid panel.
authors.affiliation: State Key Laboratory for Agrobiotechnology, Key Laboratory of Animal Genetics and Breeding of the Ministry of Agriculture, College of Animal Science and Technology, China Agricultural University, Beijing, People's Republic of China.
authors.forename: Yang
authors.initials: Y
authors.lastname: Liu
authors.forename: He-Jun
authors.initials: HJ
authors.lastname: Li
authors.forename: Xiao-Tian
authors.initials: XT
authors.lastname: Qiu
authors.forename: Hong-Wei
authors.initials: HW
authors.lastname: Guo
authors.forename: Yu-Hua
authors.initials: YH
authors.lastname: Li
authors.forename: Qin
authors.initials: Q
authors.lastname: Zhang
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D017951:Antigen Presentation / Q000235:genetics; D002417:Cattle; D002874:Chromosome Mapping; D003546:Cysteine Endopeptidases / Q000096:biosynthesis* / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D004285:Dogs; D006801:Humans; D007113:Immunity, Innate / Q000235:genetics; D051379:Mice; D008969:Molecular Sequence Data; D010802:Phylogeny; D046988:Proteasome Endopeptidase Complex / Q000096:biosynthesis / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D051381:Rats; D013552:Swine
chemical_list: C071313:LMP-2 protein; D003546:Cysteine Endopeptidases; C098948:PSMB10 protein, human; D046988:Proteasome Endopeptidase Complex