ITIH4

The protein encoded by this gene is secreted into the blood, where it is cleaved by plasma kallikrein into two smaller forms. Expression of this gene has been detected only in liver, and it seems to be upregulated during surgical trauma. This gene is part of a cluster of similar genes on chromosome 3. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Oct 2009]

Inter-Alpha-Trypsin Inhibitor Heavy Chain Family Member 4

Type II acute-phase protein (APP) involved in inflammatory responses to trauma. May also play a role in liver development or regeneration.

Acute-phase responseManual Assertion Based On ExperimentIEP:UniProtKB
Hyaluronan metabolic processIEA:InterPro
Response to cytokineManual Assertion Based On ExperimentIEP:UniProtKB

Secreted

Cleaved by plasma kallikrein to yield 100 kDa and 35 kDa fragments, and the resulting 100 kDa fragment is further converted to a 70 kDa fragment.
N- and O-glycosylated. In urine, O-linked glycosylation on threonine residues in the region from Thr-719 to Thr-725 consists of core 1 or possibly core 8 glycans. Mainly Hex(HexNAc)(2), but also some Hex(3)(HexNAc)(3). N-glycosylated but not O-glycosylated in plasma.