Pentameric protein

A pentameric protein is a quaternary protein structure that consists of five protein subunits.

General structure of pentameric protein

Examples

Ligand-gated ion channels

Five sub-units come together to form a channel. Each channel consist of two alpha chain, one beta, one gamma and one delta chain. These five chains assemble together (along with certain receptors like protons or acetylcholine) forming the structure of the channel.[1] A ligand-gated ion channel on the post-synaptic junction of the muscle-end plate is an example of such a channel. They are acetylcholine-operated ion channels, which means that acetylcholine brings about a conformational change. The channel allows the free movement of the cations like Na and K when acetylcholine binds to its receptors.

Viral capsids

Many viral capsids are formed by hexameric and pentameric proteins.[2] Such capsids are assigned a triangulation number (T-number) which describe relation between the number of pentagons and hexagons.

Carboxysomes

Protein enclosing bacterial organelles carboxysome is also made up of pentameric protein.[3]

Major histocompatibility complex (MHC) pentamers

Synthetic pentameric proteins include MHC pentamers, a type of MHC multimer, comprising five peptide-MHC complexes associated via a coiled-coil domain, attached to five fluorophore moieties. These proteins are used as reagents in immunology research.

References

Hucho F, Changeux JP (December 1973). "Molecular weight and quaternary structure of the cholinergic receptor protein extracted by detergents from Electrophorus electricus electric tissue". FEBS Letters. 38 (1): 11–5. doi:10.1016/0014-5793(73)80500-9. PMID 4772687.
Virus Capsid Model Archived 2009-10-07 at the Wayback Machine
Tanaka S, Kerfeld CA, Sawaya MR, Cai F, Heinhorst S, Cannon GC, Yeates TO (February 2008). "Atomic-level models of the bacterial carboxysome shell". Science. 319 (5866): 1083–6. doi:10.1126/science.1151458. PMID 18292340.

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[Hucho1973-1] Hucho F, Changeux JP (December 1973). "Molecular weight and quaternary structure of the cholinergic receptor protein extracted by detergents from Electrophorus electricus electric tissue". FEBS Letters. 38 (1): 11–5. doi:10.1016/0014-5793(73)80500-9. PMID 4772687.

[2] Virus Capsid Model Archived 2009-10-07 at the Wayback Machine

[3] Tanaka S, Kerfeld CA, Sawaya MR, Cai F, Heinhorst S, Cannon GC, Yeates TO (February 2008). "Atomic-level models of the bacterial carboxysome shell". Science. 319 (5866): 1083–6. doi:10.1126/science.1151458. PMID 18292340.