Complement component 1q: Difference between revisions

Revision as of 00:17, 26 December 2017

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The '''complement component 1q''' ('''C1q''') is a [[protein complex]] involved in the [[complement system]], which is part of the [[innate immune system]]. C1q together with [[C1r]] and [[C1s]] form the [[C1-complex]].

[[Antibody|Antibodies]] of the [[adaptive immune system]] can bind [[antigen]], forming an [[antigen-antibody complex]]. When C1q binds antibody-antigen complexes, the [[C1-complex]] is activated. Activation of the C1-complex intitiates the [[classical complement pathway]] of the complement system. Only theThe antibodies [[IgM]] and all [[IgG]] subclasses except [[Immunoglobulin_G#Subclasses|IgG4]] are able to initiate the complement system.

==Structure==