5b0n
From Proteopedia
Structure of Shigella effector LRR domain
Structural highlights
Function[IPA9_SHIFL] Effector proteins function to alter host cell physiology and promote bacterial survival in host tissues. This protein is an 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), an 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. Uses UBE2D2 (UBCH5B) as an E2 ubiquitin-conjugating enzyme.[1] [2] [3] Publication Abstract from PubMedInfectious diseases caused by bacteria have significant impacts on global public health. During infection, pathogenic bacteria deliver a variety of virulence factors, called effectors, into host cells. The Shigella effector IpaH9.8 functions as an ubiquitin ligase, ubiquitinating the NF-kappaB essential modulator (NEMO)/IKK-gamma to inhibit host inflammatory responses. IpaH9.8 contains leucine-rich repeats (LRRs) involved in substrate recognition and an E3 ligase domain. To elucidate the structural basis of the function of IpaH9.8, the crystal structure of the LRR domain of Shigella IpaH9.8 was determined and this structure was compared with the known structures of other IpaH family members. This model provides insights into the structural features involved in substrate specificity. Crystal structure of the substrate-recognition domain of the Shigella E3 ligase IpaH9.8.,Takagi K, Kim M, Sasakawa C, Mizushima T Acta Crystallogr F Struct Biol Commun. 2016 Apr 1;72(Pt 4):269-75. doi:, 10.1107/S2053230X16002715. Epub 2016 Mar 16. PMID:27050259[4] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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