A gene encoding, prespore-cell-inducing factor in Dictyostelium discoideum

Development, Growth & Differentiation
Takefumi KawataA Oohata

Abstract

Two factors that exist in conditioned medium (CM) of Dictyostelium discoideum induce amoebae to differentiate into prespore cells when they are incubated at a very low cell density in submerged monolayer culture. Previously, we purified one of them, a glycoprotein factor with an apparent molecular mass of 106 kDa, and we named it psi factor (psi, prespore-inducing factor). Based on the partial amino acid sequence of the purified psi factor, we have isolated the corresponding cDNA clone, which is expressed maximally at the loose mound stage. The cDNA encodes a novel protein and the predicted molecular mass of the mature secreted protein is 60 kDa. Knockout mutant strains of the psi factor gene, psiA(-), were created by targeted integration. Although these mutant strains appear to develop normally, CM from these mutants showed reduced prespore-cell-inducing activity. Rescuing the mutant strains by expression of psi factor under control of a constitutive promoter causes overproduction of psi factor protein and CM from such cells showed a 20-fold higher level of prespore-cell-inducing activity than that from wild-type cells. Further, CM from parental cells induced prespore cell division, while that from psiA null strains showed no ...Continue Reading

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Citations

Oct 8, 2011·Bioscience, Biotechnology, and Biochemistry·Manabu NakagawaShigeru Fujii
Jun 21, 2005·Developmental Biology·Lana StrmeckiCatherine J Pears
Jun 14, 2005·Developmental Biology·Ioannis Serafimidis, Robert R Kay
Jul 1, 2014·Organic Letters·Yoshiaki TakayaAkiko A Oohata

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