Biochem Biophys Res Commun 1998 Apr 07;2451:231-4. doi: 10.1006/bbrc.1998.8306.

Preferential expression of the cDNA encoding the proteasome subunit during the growth/differentiation transition of Dictyostelium cells.

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A proteasome subunit-1 gene (DAPS-1) was isolated as one preferentially expressed during the transition from growth to differentiation in Dictyostelium discoideum cells, using the differential display method. The DAPS-1 cDNA sequence with a length of 882 bp encodes a protein (Mr. 23.4 kDa) consisting of 213 amino acids. The deduced amino acid sequence of DAPS-1 showed 61% and 58% identity to the proteasome subunit Y of Xenopus laevis and Homo sapiens, respectively and 48% and 47% identity to the proteasome subunit LMP2 of Homo sapiens and Orizas latipes, respectively. Northern analysis revealed that a 1.0 kb of DAPS-1 mRNA is predominantly expressed during the early stage of differentiation induced by starvation. This seems to indicate that the DAPS-1 protein may be involved in proteolysis coupled with active exchange of the cellular protein composition during the phase-shift of Dictyostelium cells from the proliferative to differentiated state.

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Species referenced: Xenopus laevis
Genes referenced: psmb9