Essential regions of deubiquitinating enzyme activity and enhancer function for DUB-2A expressed in T-lymphocytes.
Novel subfamily members of deubiquitinating enzyme gene, DUB-1 and DUB-2, are known to be immediate-early genes and are specifically expressed in B-lymphocytes and T-lymphocytes, respectively. Recently, another deubiquitinating enzyme gene DUB-2A, expressed also in T-lymphocytes, has been isolated and we, in this study, found that Dub-2A has isopeptidase activity and there are at least 4 conserved amino acids (Cys60, Asp133, His298, and His307) that are required for catalytic activity of the enzyme. Interestingly, the conserved Asp323 was not essential for the catalytic activity. In addition, transcriptional reporter assay showed that an Ets site and 2 AP-1 sites in the enhancer domain of this gene are required for cytokine inducibility. Taken all together, these results will be very helpful in designing activators or inhibitors of this enzyme in order to regulate its expression and catalytic activity in T-lymphocytes.
Baek
Kwang-Hyun
KH
Cell and Gene Therapy Research Institute, Pochon CHA University, CHA General Hospital, Seoul, Republic of Korea. baek@cha.ac.kr
Kim
Yong-Soo
YS
Lee
Hye-Jin
HJ
Kang
Incheol
I
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002460:Cell Line; D017124:Conserved Sequence; D010450:Endopeptidases / Q000235:genetics* / Q000378:metabolism*; D004742:Enhancer Elements, Genetic; D015971:Gene Expression Regulation, Enzymologic; D017874:Immediate-Early Proteins / Q000235:genetics* / Q000378:metabolism; D051379:Mice; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D017434:Protein Structure, Tertiary; D017386:Sequence Homology, Amino Acid; D013601:T-Lymphocytes / Q000201:enzymology*; D014452:Ubiquitins / Q000378:metabolism*
D017874:Immediate-Early Proteins; D014452:Ubiquitins; C103857:Dub2 protein, mouse; D010450:Endopeptidases