Linked Life Data

8204622

Source:http://linkedlifedata.com/resource/pubmed/id/8204622

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
1994-7-8
pubmed:abstractText
Azidoanilido-GTP (AA-GTP), a hydrolysis-resistant, photoreactive GTP analog, is becoming an increasingly popular tool for identifying activation of specific G proteins by receptors within native plasma membranes. Despite the use of AA-GTP as an affinity probe, surprisingly little is known regarding the ability of various G protein alpha subunits to bind this analog. To directly address this issue, we compared the ability of four purified G protein alpha subunits (Go, Gi2, Gs, and Gz) to bind AA-GTP with their ability to bind GTP gamma S, a GTP analog commonly used to characterize the GTP-binding properties of G proteins. All four G alpha subunits tested bound AA-GTP in a manner distinct from their binding of GTP gamma S. One of these proteins, Gs alpha, required millimolar levels of free Mg2+ for significant binding of AA-GTP, while Go alpha and Gi alpha 2 displayed peak AA-GTP binding at approximately 100 microM free Mg2+. The fourth G alpha subunit, Gz, bound AA-GTP very poorly relative to GTP gamma S regardless of the magnesium concentration. These results indicate that individual G protein alpha subunits differ markedly in their ability to bind AA-GTP. Use of AA-GTP to identify specific G protein-receptor interactions must therefore take into account the varied abilities of G alpha subunits to bind this analog.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
0006-2960
pubmed:author
pubmed:issnType
Print
pubmed:day
7
pubmed:volume
33
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
6877-83
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1994
pubmed:articleTitle
Subtype-specific binding of azidoanilido-GTP by purified G protein alpha subunits.
pubmed:affiliation
Department of Molecular Cancer Biology, Duke University Medical Center, Durham, North Carolina 27710.
pubmed:publicationType
Journal Article, Comparative Study, In Vitro, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't