C1
First component of complement; actually three subcomponents, C1q, C1r and C1s, that form a complex in the presence of calcium ions. C1q, the recognition subunit, has an unusual structure of collagen-like triple helices forming a stalk for its Ig-binding globular heads. Upon binding to immune complexes the C1 complex becomes an active protease that cleaves and activates C4 and C2.

Dictionary of molecular biology. 2004.

Look at other dictionaries:

  • C1 — C1, C01, C.I or C 1 may refer to:* C1, an international standard paper size defined in ISO 216 (648×917 mm) * C1, also known as Vlakplaas, a unit of the South African Police responsible for assassinating opponents of Apartheid during the 1980s *… …   Wikipedia

  • C1 — C1, C 1 oder C 1 steht für: ein genormtes Papierformat (DIN 476/ISO 216) ein Fahrzeugmodell des Automobilherstellers Citroën, siehe Citroën C1 ein PKW Modell aus dem Jahr 1935; siehe Chrysler C1 einen überdachten Motorroller von BMW, siehe BMW C1 …   Deutsch Wikipedia

  • C1 — может означать: C1  формат бумаги. C1 (штурмовая винтовка) …   Википедия

  • C1 — noun (Brit) (a member of) the social class or group categorized as supervisory and clerical • • • Main Entry: ↑C …   Useful english dictionary

  • C1 — Cette page d’homonymie répertorie les différents sujets et articles partageant un même nom.   Sigles d’une seule lettre > Sigles de deux lettres   Sigles de trois lettres   Sigles de quatre lettres …   Wikipédia en Français

  • C1 — principal caudal fin ray …   Dictionary of ichthyology

  • C1 — First Cervical Vertebra (Medical » Physiology) …   Abbreviations dictionary

  • C1 — first cervical nerve; first cervical vertebra; first component of complement * * * the first component of the classical pathway of complement activation, a pentamolecular calcium dependent complex comprising C1q and two molecules each of C1r and… …   Medical dictionary

  • C1 — first rib * * * the first component of the classical pathway of complement activation, a pentamolecular calcium dependent complex comprising C1q and two molecules each of C1r and C1s …   Medical dictionary

  • c1 — activated first component of complement * * * the first component of the classical pathway of complement activation, a pentamolecular calcium dependent complex comprising C1q and two molecules each of C1r and C1s …   Medical dictionary

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