Linked Life Data

12646252

Source:http://linkedlifedata.com/resource/pubmed/id/12646252

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
2003-3-20
pubmed:abstractText
Drosophila Numb protein functions as an antagonist against Notch signal. The expression of this protein is asymmetrical in divided cells and thought to be involved in the neural cell differentiation and/or cell fate. Human homologue of Numb (hNumb) was cloned as Mdm2-binding protein by yeast two-hybrid screening. Since Mdm2 is an oncoprotein and has ubiquitin ligase activity toward tumor suppressor p53, we assessed to find out whether Mdm2 ubiquitinylates the hNumb protein. The recombinant hNumb expressed in Sf-9 cells using baculovirus protein expression system bound to Mdm2 in vitro. When hNumb was subjected to in vitro ubiquitinylation assay system, which contains E1, E2, or UbcH5c, and Mdm2, hNumb was ubiquitinylated as efficiently as the p53 protein. However, when the Ring-finger domain mutant of Mdm2 was used in place of wild-type Mdm2, hNumb was not ubiquitinylated. Furthermore, when U2OS cells were co-transfected with hNumb and Mdm2, the hNumb protein was ubiquitinylated and degraded. These data strongly suggest that Mdm2 functions as the ubiquitin ligase toward hNumb and that it induces its degradation in intact cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0006-291X
pubmed:author
pubmed:issnType
Print
pubmed:day
21
pubmed:volume
302
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
869-72
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Mammalian Numb is a target protein of Mdm2, ubiquitin ligase.
pubmed:affiliation
Division of Molecular Life Science, School of Life Science, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't