E3 ubiquitin-protein ligase ipaH9.8

UniProtKB accession:  Q8VSC3

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Effector E3 ubiquitin ligase that interferes with host's ubiquitination pathway and modulates the acute inflammatory responses, thus facilitating bacterial colonization within the host cell (PubMed:18005683, PubMed:18997778, PubMed:20831869, PubMed:24248594, PubMed:29024643, PubMed:29144452, PubMed:31216343, PubMed:33303953). Interacts with IKBKG (NEMO) and TNIP1 (ABIN-1), a ubiquitin-binding adapter protein, which results in TNIP1-dependent 'Lys-27'-linked polyubiquitination of IKBKG (PubMed:18005683). Consequently, polyubiquitinated IKBKG undergoes proteasome-dependent degradation, which perturbs NF-kappa-B activation during bacterial infection (PubMed:18005683, PubMed:20010814). Mediates polyubiquitination of host U2AF1, leading to its proteasomal degradation (PubMed:15950937). Catalyzes 'Lys-48'-linked polyubiquitination and subsequent degradation of a subset of host guanylate-binding proteins (GBP1, GBP2, GBP4 and GBP6), thereby suppressing host cell defense (PubMed:29024643, PubMed:29144452, PubMed:31216343, PubMed:33303953, PubMed:37014865). In contrast, host GBP3 and GBP7 are not ubiquitinated by IpaH9.8 (PubMed:29024643, PubMed:29144452, PubMed:31216343). Uses UBE2D2 (UBCH5B) as an E2 ubiquitin-conjugating enzyme (PubMed:18005683).