Summary of KNG1

The gene codes for a protein, kininogen 1. It generates HMWK and LMWK. HMWK is used for blood coagulation, but LMWK is not [R].

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The Function of KNG1

(1) Kininogens are inhibitors of thiol proteases; (2) HMW-kininogen plays an important role in blood coagulation by helping to position optimally prekallikrein and factor XI next to factor XII; (3) HMW-kininogen inhibits the thrombin- and plasmin-induced aggregation of thrombocytes; (4) the active peptide bradykinin that is released from HMW-kininogen shows a variety of physiological effects: (4A) influence in smooth muscle contraction, (4B) induction of hypotension, (4C) natriuresis and diuresis, (4D) decrease in blood glucose level, (4E) it is a mediator of inflammation and causes (4E1) increase in vascular permeability, (4E2) stimulation of nociceptors (4E3) release of other mediators of inflammation (e.g. prostaglandins), (4F) it has a cardioprotective effect (directly via bradykinin action, indirectly via endothelium-derived relaxing factor action); (5) LMW-kininogen inhibits the aggregation of thrombocytes; (6) LMW-kininogen is in contrast to HMW-kininogen not involved in blood clotting.

Protein names

Recommended name:


Short name:


Alternative name(s):

Alpha-2-thiol proteinase inhibitor
Fitzgerald factor
High molecular weight kininogen
Williams-Fitzgerald-Flaujeac factor
Kallidin I
Kallidin II

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KNG1 Interacts with These Diseases

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