Atetramer (/ˈtɛtrəmər/) (tetra-, "four" +-mer, "parts") is anoligomer formed from fourmonomers orsubunits. The associated property is calledtetramery. An example frominorganic chemistry istitanium methoxide with theempirical formula Ti(OCH3)4, which is tetrameric in solid state and has themolecular formula Ti4(OCH3)16.[1] An example fromorganic chemistry iskobophenol A, a substance that is formed by combining four molecules ofresveratrol.[2][3]
In biochemistry, it similarly refers to a biomolecule formed of four units, that are the same (homotetramer), i.e. as inConcanavalin A or different (heterotetramer), i.e. as inhemoglobin. Hemoglobin has 4 similar sub-units whileimmunoglobulins have 2 very different sub-units. The different sub-units may have each their own activity, such as bindingbiotin inavidin tetramers, or have a common biological property, such as theallosteric binding ofoxygen in hemoglobin.
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