Source:http://linkedlifedata.com/resource/pubmed/id/12814262
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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
3
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pubmed:dateCreated |
2003-6-19
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pubmed:abstractText |
Carbamylation is widely quoted as being a problem in 2-D gel analysis and the associated sample preparation steps. This modification occurs when iso-cyanate, a urea break-down product, covalently modifies lysine residues, thus inducing a change in isoelectric point. Urea is used at up to 9 M concentrations in sample preparation and 2-D gels because of its ability to disrupt protein structure and effect denaturation without the need for ionic surfactants such as SDS. We have studied carbamylation using 7 M urea and 2 M thiourea, under a range of experimental temperatures to establish when, and if, it occurs and what can be done to minimize the modification. The actual time required for protein extraction from a tissue is usually short compared to the time required for procedures such as reduction and alkylation and IPG rehydration and focusing. Therefore, it is the temperature during these post-extraction procedures that is the most critical factor. Our experiments have shown that carbamylation does not occur during electrophoresis in the presence of urea, even with prolonged run-times. However, under poorly controlled sample preparation and storage conditions, it can become a major event.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical |
http://linkedlifedata.com/resource/pubmed/chemical/Carbamates,
http://linkedlifedata.com/resource/pubmed/chemical/Cyanates,
http://linkedlifedata.com/resource/pubmed/chemical/Proteins,
http://linkedlifedata.com/resource/pubmed/chemical/carbamic acid,
http://linkedlifedata.com/resource/pubmed/chemical/isocyanic acid
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pubmed:status |
MEDLINE
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pubmed:issn |
1535-3893
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
2
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
239-42
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:12814262-Alkylation,
pubmed-meshheading:12814262-Carbamates,
pubmed-meshheading:12814262-Chemical Fractionation,
pubmed-meshheading:12814262-Cyanates,
pubmed-meshheading:12814262-Electrophoresis, Gel, Two-Dimensional,
pubmed-meshheading:12814262-Escherichia coli,
pubmed-meshheading:12814262-Proteins,
pubmed-meshheading:12814262-Spectrometry, Mass, Matrix-Assisted Laser...
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pubmed:articleTitle |
Carbamylation of proteins in 2-D electrophoresis--myth or reality?
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pubmed:affiliation |
Proteome Systems Limited, North Ryde, Sydney, NSW, Australia.
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pubmed:publicationType |
Journal Article,
Research Support, Non-U.S. Gov't
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