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Tetramer

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A tetramer is an oligomer formed from four monomers or protein subunits. The associated propriety is called tetramery. An example is kobophenol A, a molecule formed from four stilbenoids monomers.
In biochemistry, it similarly refers to a biomolecule formed of four units, that are the same, i.e. as in Concanavalin A or different, i.e. as in hemoglobin. Hemoglobin has 4 similar sub-units while immunoglobulins have 2 very different sub-units. The different sub-units may have each their own activity, such as binding biotin in avidin tetramers, or have a common biological property, such as the allosteric binding of oxygen in hemoglobin.


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