What is dimer in biology

CME Programs on Dimer. Dimer en Espanol. Dimer en Francais. Dimer in the Marketplace. Patents on Dimer. List of terms related to Dimer. A dimer is a chemical or biological entity consisting of two subunits called monomers , which are held together by either intramolecular forces covalent bonds or weaker intermolecular forces. An example of a molecular dimer i. Molecular dimers are often formed by the reaction of two identical compounds e.

In this example, monomer "A" is said to dimerise to give the dimer "A-A". Diaminocarbenes are another example which dimerise, to give tetraaminoethylenes. An example of an intermolecular or physical dimer is acetic acid wherein hydrogen bonds hold the two molecules together. The water dimer is another such dimer. The term homodimer is used when the two molecules are identical e. A-A and heterodimer when they are not e.

The reverse of dimerisation is often called disassociation. In biochemistry and molecular biology , dimers of macromolecules like proteins and nucleic acids are often observed.

The dimerization of identical subunits is called homodimerization ; the dimerization of different subunits or unrelated monomers is called heterodimerization. Most dimers in biochemistry are not connected by covalent bonds with the exception of disulfide bridges.

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