title: Differential subcellular localization and activity of kelch repeat proteins KLHDC1 and KLHDC2.
abstract: We have previously identified and characterized human KLHDC2/HCLP-1, a kelch repeat protein that interacts with and inhibits transcription factor LZIP. In this study, we identified and characterized a paralog of KLHDC2 called KLHDC1. KLHDC1 and KLHDC2 share about 50% identity at the level of amino acid sequence and both gene loci localize to human chromosome 14q21.3. This cluster of KLHDC1 and KLHDC2 genes is highly conserved in vertebrates ranging from pufferfish to human. Both genes are expressed highly in skeletal muscle, but weakly in various other tissues. While KLHDC2 was predominantly found in the nucleus, KLHDC1 is a cytoplasmic protein. Neither KLHDC1 nor KLHDC2 binds to actin. In addition, KLHDC1 was unable to inhibit LZIP/CREB3-mediated transcriptional activation. Thus, KLHDC1 and KLHDC2 have differential localization and activity in cultured mammalian cells.
authors.affiliation: Department of Biochemistry, The University of Hong Kong, 3/F, Laboratory Block, Faculty of Medicine Building, 21 Sassoon Road, Hong Kong, China.
authors.forename: King-Tung
authors.initials: KT
authors.lastname: Chin
authors.forename: Hai-Tao
authors.initials: HT
authors.lastname: Xu
authors.forename: Yick-Pang
authors.initials: YP
authors.lastname: Ching
authors.forename: Dong-Yan
authors.initials: DY
authors.lastname: Jin
mesh_terms: D000199:Actins / Q000378:metabolism; D000595:Amino Acid Sequence; D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000378:metabolism; D000951:Antigens, Neoplasm / Q000145:classification / Q000235:genetics / Q000378:metabolism*; D002352:Carrier Proteins / Q000235:genetics / Q000378:metabolism*; D005231:Fatty Acids, Unsaturated / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D008969:Molecular Sequence Data; D010802:Phylogeny; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D014018:Tissue Distribution
chemical_list: D000199:Actins; D000903:Antibiotics, Antineoplastic; D000951:Antigens, Neoplasm; D002352:Carrier Proteins; D005231:Fatty Acids, Unsaturated; C521116:KLHDC1 protein, human; C497694:KLHDC2 protein, human; C038753:leptomycin B