Biological Unit: Difference between revisions
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The "Biological Unit" is the quaternary structure of a protein that is believed to be the functional form of the molecule. It can be a single chain, or a quaternary assembly of multiple identical or non-identical chains. For example, the biological unit of hemoglobin includes two alpha chains and two beta chains, making it a tetrameric α<sub>2</sub>β<sub>2</sub> structure. When a biological unit contains multiple chains that have co-evolved to bind to each other, it may also be referred to as a ''specific oligomer''. | The "Biological Unit" is the quaternary structure of a protein that is believed to be the functional form of the molecule. It can be a single chain, or a quaternary assembly of multiple identical or non-identical chains. For example, the biological unit of hemoglobin includes two alpha chains and two beta chains, making it a tetrameric α<sub>2</sub>β<sub>2</sub> structure. When a biological unit contains multiple chains that have co-evolved to bind to each other, it may also be referred to as a ''specific oligomer''. | ||
Biological units displayed in the 'Structure Boxes' on Proteopedia pages for PDB entries are predicted | Biological units displayed in the 'Structure Boxes' on Proteopedia pages for PDB entries are those predicted and calculated using the [[PISA|Protein Interfaces, Surfaces and Assemblies Server]] (PISA). | ||
Of course, what is the functional form (biological unit) under one set of conditions may change under a different set of conditions, so there may be more than one functional form (biological unit) that includes a given protein chain. For example, phosphorylation or dephosphorylation by protein kinases or phosphatases often change the affinities between proteins, and hence their quaternary assemblies. | Of course, what is the functional form (biological unit) under one set of conditions may change under a different set of conditions, so there may be more than one functional form (biological unit) that includes a given protein chain. For example, phosphorylation or dephosphorylation by protein kinases or phosphatases often change the affinities between proteins, and hence their quaternary assemblies. | ||
