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dimer
dimer A protein that is made up of two polypeptide chains or subunits paired together. If the subunits are identical in aminoacid sequence the protein is said to be homomeric; if they are different, it is heteromeric. Dimeric proteins may be detected by electrophoresis. In monomeric enzymes, the isoenzyme pattern of the heterozygote will represent a simple mixture of the two forms occurring by themselves in each of the corresponding homozygotes. In dimeric enzymes, there are homomeric forms representing the two homozygotes, but the heterozygote occurs in heteromeric form: when stained after electrophoresis, this results in three bands (instead of two bands as with a monomer). An example of a dimeric enzyme is glucose–phosphate isomerase. Some enzymes are trimeric (comprising three components) or tetrameric (with four components).
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MICHAEL ALLABY. "dimer." A Dictionary of Zoology. 1999. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "dimer." A Dictionary of Zoology. 1999. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O8-dimer.html MICHAEL ALLABY. "dimer." A Dictionary of Zoology. 1999. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O8-dimer.html |
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dimer
dimer A protein that is made up of two polypeptide chains or subunits paired together. If the subunits are identical in amino-acid sequence the protein is said to be homomeric; if they are different, it is heteromeric. Dimeric proteins may be detected by electrophoresis. In monomeric enzymes, the isozyme pattern of the heterozygote will represent a simple mixture of the two forms occurring by themselves in each of the corresponding homozygotes. In dimeric enzymes, there are homomeric forms representing the two homozygotes, but the heterozygote occurs in heteromeric form: when stained after electrophoresis, this results in 3 bands (instead of 2 bands as with a monomer). An example of a dimeric enzyme is glucose-phosphate isomerase. Some enzymes are trimeric (comprising 3 components) or tetrameric (with 4 components).
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Cite this article
MICHAEL ALLABY. "dimer." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. MICHAEL ALLABY. "dimer." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O7-dimer.html MICHAEL ALLABY. "dimer." A Dictionary of Plant Sciences. 1998. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-dimer.html |
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dimer
di·mer / ˈdīmər/ • n. Chem. a molecule or molecular complex consisting of two identical molecules linked together. DERIVATIVES: di·mer·ic / dīˈmerik/ adj. |
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Cite this article
"dimer." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. 30 May. 2012 <http://www.encyclopedia.com>. "dimer." The Oxford Pocket Dictionary of Current English. 2009. Encyclopedia.com. (May 30, 2012). http://www.encyclopedia.com/doc/1O999-dimer.html "dimer." The Oxford Pocket Dictionary of Current English. 2009. Retrieved May 30, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O999-dimer.html |
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