RRC ID 6648
Author Morita T, Saitoh K, Takagi T, Maeda Y.
Title Involvement of the glucose-regulated protein 94 (Dd-GRP94) in starvation response of Dictyostelium discoideum cells.
Journal Biochem Biophys Res Commun
Abstract Upon deprivation of nutrients, Dictyostelium discoideum Ax-2 cells arrest proliferation and initiate a metamorphosed developmental program including induction of altered gene expressions which are necessary for differentiation. In Ax-2 cells, we found out a member of Hsp90 family usually contained in the endoplasmic reticulum (ER), Dd-GRP94 (Dictyostelium discoideum glucose-regulated protein 94). In general, GRP94 are induced either by glucose-depletion or by depletion of Ca(2+) in intracellular Ca(2+) stores. Unexpectedly, however, the expression of Dd-grp94 was greatly reduced within 60 min of starvation. Dd-grp94-overexpressing cells (GRP94(OE) cells) collected without forming distinct aggregation streams, and never formed normal fruiting bodies. Also, prespore differentiation as well as maturation into spores and stalk cells were particularly impaired in the GRP94(OE) cells. Thus Dd-GRP94 seems to be crucial in late differentiation as well as in starvation response.
Volume 274(2)
Pages 323-31
Published 2000-8-2
DOI 10.1006/bbrc.2000.3096
PII S0006-291X(00)93096-1
PMID 10913338
MeSH Amino Acids / deficiency Amino Acids / metabolism Animals Base Sequence Cell Differentiation / physiology Cyclic AMP / metabolism Cyclic AMP / pharmacology Dictyostelium / cytology Dictyostelium / drug effects Dictyostelium / genetics* Dictyostelium / metabolism* Electroporation Food Deprivation / physiology Gene Expression Regulation, Developmental Glucose / deficiency Glucose / metabolism HSP70 Heat-Shock Proteins / genetics* HSP70 Heat-Shock Proteins / metabolism* Membrane Proteins / genetics* Membrane Proteins / metabolism* Molecular Sequence Data Receptors, Cyclic AMP / biosynthesis Sequence Analysis, DNA Sequence Homology, Amino Acid
IF 2.985
Times Cited 17
Cellular slime molds G00160