A 77-kDa subcomponent of complement C1, encoded by gene C1S, is a SERINE PROTEASE existing as a proenzyme (homodimer) in the intact complement C1 complex. Upon the binding of COMPLEMENT C1Q to antibodies, the activated COMPLEMENT C1R cleaves C1s into two chains, A (heavy) and B (light, the serine protease), linked by disulfide bonds yielding the active C1s. The activated C1s, in turn, cleaves COMPLEMENT C2 and COMPLEMENT C4 to form C4b2a (CLASSICAL C3 CONVERTASE).
Complement C1s has been studied across 15 research domains including 🛡️ Immunity, 🔬 Oncology, 🦴 Bone & Joint, 🫘 Kidney, ⏳ Longevity & Aging. The primary research focus is 🛡️ Immunity with 16% of studies addressing this area.
This evidence profile for Complement C1s is generated deterministically from 88 PubMed-indexed studies. All data is corpus-verified with Merkle proofs. BiohacksAI does not provide medical advice. Always consult a healthcare professional before starting any supplement regimen.
Data source: PubMed/MEDLINE (NLM). Corpus version: current. Patent pending (EVE-PAT-2026-001). © 2026 Organiq Sweden AB.