Linked Life Data

17226776

Source:http://linkedlifedata.com/resource/pubmed/id/17226776

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2007-7-31
pubmed:abstractText
Phospholipid scramblase 3 (PLS3) is a member of the phospholipid scramblase family present in mitochondria. PLS3 plays an important role in regulation of mitochondrial morphology, respiratory function, and apoptotic responses. PLS3 is phosphorylated by PKC-delta at Thr21 and is the mitochondrial target of PKC-delta-induced apoptosis. Cells with overexpression of PLS3, but not the phosphoinhibitory mutant PLS3(T21A), are more susceptible to apoptosis induced by AD198, an extranuclear targeted anthracycline that activates PKC-delta. Here we report that the phosphomimetic mutant of PLS3(T21D) by itself can induce apoptosis in HeLa cells. Using proteoliposomes with addition of pyrene-labeled phosphatidylcholine (PC) at the outer leaflet, we measured the lipid flip-flop activity of PLS3 and its phosphorylation mutant. PLS3(T21D) is more potent than wild-type PLS3 or PLS3(T21A) to transfer pyrene-PC from the outer leaflet to the inner leaflet of liposomes. Based on our previous finding that PLS3 enhances tBid-induced mitochondrial damages, we tested the hypothesis that PLS3 enhances cardiolipin translocation to mitochondrial surface and facilitates tBid targeting. Fluorescein-labeled tBid(G94E) was used as a probe to quantify cardiolipin on the surface of mitochondria. Mitochondria from cells treated with AD198 or cells expressing PLS3(T21D) had a higher level of tBid-binding capacity than control cells or cells expressing wild-type PLS3. These findings indicate that phosphorylation of PLS3 by PKC-delta induces PLS3 activation to facilitate mitochondrial targeting of tBid and apoptosis.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0730-2312
pubmed:author
pubmed:copyrightInfo
(c) 2007 Wiley-Liss, Inc.
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
101
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1210-21
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Phosphorylation of mitochondrial phospholipid scramblase 3 by protein kinase C-delta induces its activation and facilitates mitochondrial targeting of tBid.
pubmed:affiliation
Kunming Medical College, Kunming, Yunnan, P.R. China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't, Research Support, N.I.H., Extramural