Linked Life Data

15367206

Source:http://linkedlifedata.com/resource/pubmed/id/15367206

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2004-9-15
pubmed:abstractText
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 cell division inducing activity. Our results indicate that psi factor protein is a novel type of growth factor that does not belong to any of the families of growth factor so far identified in animals.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0012-1592
pubmed:author
pubmed:issnType
Print
pubmed:volume
46
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
383-92
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2004
pubmed:articleTitle
A gene encoding, prespore-cell-inducing factor in Dictyostelium discoideum.
pubmed:affiliation
Department of Biology, Faculty of Science, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't