Cloning and characterization of a novel human cDNA encoding a J-domain protein (DNAJA5) from the fetal brain.

J-domain proteins are involved in protein importing and sorting, protein translocation into the endoplasmic reticulum and interaction with hsp70, cell cycle regulation and exocytosis. During the large-scale sequencing analysis of a human fetal brain cDNA library, we isolated a cDNA clone encoding a putative 531 amino acid protein with a DnaJ domain and C2H2-type zinc finger motif, which was named as DNAJA5 (human DnaJ homology subfamily A member 5). The putative protein of DNAJA5 gene was homologous to Caenorhabditis elegans DNJ-17 (identity 33.2% similarity 45.1%). By mapping, we located DNAJA5 gene to human chromosome 5p12-5p13. The DNAJA5 gene contained at least 12 exons that spanned more than 25.6 kb of the genomic sequence. The reverse transcription-polymerase chain reaction analysis indicated that it was expressed in the human brain, placenta, kidney and pancreas. DNAJA5 might play a role in co-operating with Hsp70.

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