E3 ubiquitin-protein ligase ipaH9.8

UniProtKB accession:  D2AJU0

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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. Interacts with IKBKG (NEMO) and TNIP1 (ABIN-1), a ubiquitin-binding adapter protein, which results in TNIP1-dependent 'Lys-27'-linked polyubiquitination of IKBKG. Consequently, polyubiquitinated IKBKG undergoes proteasome-dependent degradation, which perturbs NF-kappa-B activation during bacterial infection. Mediates polyubiquitination of host U2AF1, leading to its proteasomal degradation. 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. In contrast, host GBP3 and GBP7 are not ubiquitinated by IpaH9.8. Uses UBE2D2 (UBCH5B) as an E2 ubiquitin-conjugating enzyme.