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	Text is available under the [https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License Creative Commons Attribution-ShareAlike License]; additional terms may apply. By using this site, you agree to the [https://foundation.wikimedia.org/wiki/Terms_of_Use Terms of Use] and [https://foundation.wikimedia.org/wiki/Privacy_policy Privacy Policy]. Wikipedia® is a registered trademark of the [https://www.wikimediafoundation.org/ Wikimedia Foundation, Inc.], a non-profit organization.		Text is available under the [https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License Creative Commons Attribution-ShareAlike License]; additional terms may apply. By using this site, you agree to the [https://foundation.wikimedia.org/wiki/Terms_of_Use Terms of Use] and [https://foundation.wikimedia.org/wiki/Privacy_policy Privacy Policy]. Wikipedia® is a registered trademark of the [https://www.wikimediafoundation.org/ Wikimedia Foundation, Inc.], a non-profit organization.
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			<gallery>
			File:Kinesin_walking.gif\|Kinesin walking along a microtubule
			File:Barnase-barstar-1brs.png\|Barnase-barstar complex
			File:Essential_proteins_in_yeast_complexes.png\|Essential proteins in yeast complexes
			</gallery>

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'''Protein complex''' or '''protein assembly''' is a group of two or more [[protein]]s that bind together, often to carry out a specific function. There are several different types of protein complexes, including [[enzyme complex]]es, [[structural protein]] complexes, and [[transport protein]] complexes.

== Structure ==

Protein complexes can be composed of identical proteins (homomers) or different proteins (heteromers). The proteins in a complex are held together by [[protein-protein interaction]]s, which can involve [[hydrogen bond]]s, [[ionic bond]]s, [[disulfide bond]]s, and [[hydrophobic interaction]]s.

== Function ==

Protein complexes carry out a wide range of functions in the cell. Some protein complexes, such as [[ribosome]]s, are involved in [[protein synthesis]]. Others, like the [[proteasome]], are involved in [[protein degradation]]. Protein complexes also play key roles in [[cell signaling]], [[DNA replication]], and [[cell division]].

== Examples ==

Some examples of protein complexes include:

* [[Hemoglobin]], a protein complex that carries oxygen in the blood
* [[Photosystem II]], a protein complex involved in photosynthesis
* [[DNA polymerase]], a protein complex involved in DNA replication
* [[ATP synthase]], a protein complex that generates ATP

== See also ==

* [[Protein structure]]
* [[Protein-protein interaction]]
* [[Protein folding]]
* [[Protein function]]

[[Category:Protein complexes]]
[[Category:Cell biology]]
[[Category:Biochemistry]]

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== References ==

<references />

== External links ==

* [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2696357/ Protein Complexes and Functional Genomics] - An article from the National Center for Biotechnology Information
* [https://www.sciencedirect.com/topics/biochemistry-genetics-and-molecular-biology/protein-complex Protein Complex] - A topic page from ScienceDirect

This page was last edited on 1 January 2022, at 00:00 (UTC).
Text is available under the [https://en.wikipedia.org/wiki/Wikipedia:Text_of_Creative_Commons_Attribution-ShareAlike_3.0_Unported_License Creative Commons Attribution-ShareAlike License]; additional terms may apply. By using this site, you agree to the [https://foundation.wikimedia.org/wiki/Terms_of_Use Terms of Use] and [https://foundation.wikimedia.org/wiki/Privacy_policy Privacy Policy]. Wikipedia® is a registered trademark of the [https://www.wikimediafoundation.org/ Wikimedia Foundation, Inc.], a non-profit organization.
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Protein complex - Revision history

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