Cloning of apg-2 encoding a novel member of heat shock protein 110 family

Gene
Y KanekoJun Fujita

Abstract

Chinese hamster heat shock protein 110-encoding gene (hsp110), mouse apg-1 and human hsp70RY are structurally related genes, with the first two encoding about 110-kDa HSPs [Yoon et al. (1995) J. Biol. Chem. 270, 15725-15733; Kaneko et al. (1997) J. Biol. Chem., in press; Fathallah et al. (1993) J. Immunol. 151, 810-813]. Using apg-1 cDNA as a probe, we isolated a novel cDNA, apg-2 from a mouse testis cDNA library, which was highly homologous to human hsp70RY. However, the predicted amino acid (aa) sequence of APG-2 was longer (841 aa) than that of HSP70RY (701 aa) and comparable to those of HSP110 and APG-1. Northern blot analysis revealed that the expression of apg-2 transcripts was ubiquitous in various mouse tissues, and most abundant in the testis and ovary. While induction of hsp70 transcripts was observed in mouse TAMA26 Sertoli cells and NIH/3T3 fibroblasts on temperature shift from 37 degrees C to 42 degrees C (traditional heat shock) or from 32 degrees C to 39 degrees C, apg-2 transcripts were not induced under either condition. These results suggest that apg-2 is an isoform of mouse homolog of hsp70RY, but that it belongs to the hsp110 family instead of hsp70 family, and that it plays a role under non-stress conditions.

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