Characterization of two isoforms of a human DnaJ homologue, HSJ2

R Hanai, K Mashima - Molecular biology reports, 2003 - Springer
R Hanai, K Mashima
Molecular biology reports, 2003Springer
Two cDNA forms were characterized for a human dnaJ homologue, HSJ2. Nucleotide
sequencing showed that the gene product HSJ2 was longer than previously reported,
extending its homology to other human DnaJ paralogues, and that the two cDNAs encoded
two proteins as a result of alternative splicing. The products were 326 amino acids
(designated as HSJ2a) and 241 amino acids (HSJ2b) in length, sharing the N-terminal 231
amino acids including the DnaJ homology region. When fused to green fluorescent protein …
Abstract
Two cDNA forms were characterized for a human dnaJ homologue, HSJ2. Nucleotide sequencing showed that the gene product HSJ2 was longer than previously reported, extending its homology to other human DnaJ paralogues, and that the two cDNAs encoded two proteins as a result of alternative splicing. The products were 326 amino acids (designated as HSJ2a) and 241 amino acids (HSJ2b) in length, sharing the N-terminal 231 amino acids including the DnaJ homology region. When fused to green fluorescent protein and expressed in HeLa cells, HSJ2a was found to be localized to the nucleus, indicating that HSJ2a is a nuclear co-chaperone. HSJ2b, however, was observed throughout the cell, consistent with the elimination of a putative nuclear localization signal sequence as a result of the alternative splicing.
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