A Novel Human BTB-kelch Protein KLHL31, Strongly Expressed in Muscle and Heart, Inhibits Transcriptional Activities of TRE and SRE

  • Yu, Weishi (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Li, Yongqing (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Zhou, Xijin (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Deng, Yun (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Wang, Zequn (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Yuan, Wuzhou (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Li, Dali (Institute of Biomedical Sciences and School of Life Sciences, East China Normal University) ;
  • Zhu, Chuanbing (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Zhao, Xueying (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Mo, Xiaoyang (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Huang, Wen (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Luo, Na (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Yan, Yan (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Ocorr, Karen (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Bodmer, Rolf (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Wang, Yuequn (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University) ;
  • Wu, Xiushan (The Center for Heart Development, Key Lab of Ministry of Education for Development Biology and Protein Chemistry, College of Life Sciences, Hunan Normal University)
  • Received : 2007.12.08
  • Accepted : 2008.08.20
  • Published : 2008.11.30

Abstract

The Bric-a-brac, Tramtrack, Broad-complex (BTB) domain is a protein-protein interaction domain that is found in many zinc finger transcription factors. BTB containing proteins play important roles in a variety of cellular functions including regulation of transcription, regulation of the cytoskeleton, protein ubiquitination, angiogenesis, and apoptosis. Here, we report the cloning and characterization of a novel human gene, KLHL31, from a human embryonic heart cDNA library. The cDNA of KLHL31 is 5743 bp long, encoding a protein product of 634 amino acids containing a BTB domain. The protein is highly conserved across different species. Western blot analysis indicates that the KLHL31 protein is abundantly expressed in both embryonic skeletal and heart tissue. In COS-7 cells, KLHL31 proteins are localized to both the nucleus and the cytoplasm. In primary cultures of nascent mouse cardiomyocytes, the majority of endogenous KLHL31 proteins are localized to the cytoplasm. KLHL31 acts as a transcription repressor when fused to GAL4 DNA-binding domain and deletion analysis indicates that the BTB domain is the main region responsible for this repression. Overexpression of KLHL31 in COS-7 cells inhibits the transcriptional activities of both the TPA-response element (TRE) and serum response element (SRE). KLHL31 also significantly reduces JNK activation leading to decreased phosphorylation and protein levels of the JNK target c-Jun in both COS-7 and Hela cells. These results suggest that KLHL31 protein may act as a new transcriptional repressor in MAPK/JNK signaling pathway to regulate cellular functions.

Keywords

BTB domain;deletion analysis;JNK;overexpression;transcriptional repressor;TRE

Acknowledgement

Supported by : National Natural Science Foundation of China, PCSIRT of Education Ministry of China, National Basic Research Program of China, New Century Excellent Talents in University, China Postdoctoral Science Foundation, Foundation of Hunan Province, Science and Technology Commission of Shanghai Municipality

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