6cgj

Structure of the HAD domain of effector protein Lem4 (lpg1101) from Legionella pneumophila

spinqualitylabelsall models 6cgj, resolution 1.75Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6cgj is a 1 chain structure with sequence from Legph. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACT, GOL, MG Related: 6cdw Gene: lpg1101 (LEGPH) Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Legionella pneumophila is a Gramnegative pathogenic bacterium that causes severe pneumonia in humans. It establishes a replicative niche called Legionella-containing vacuole (LCV) that allows bacteria to survive and replicate inside pulmonary macrophages. To hijack host cell defense systems, L. pneumophila injects over 300 effector proteins into the host cell cytosol. The Lem4 effector (lpg1101) consists of two domains: an N-terminal HAD (haloacid dehalogenase) domain with unknown function and a C-terminal PI(4)P-binding domain that anchors Lem4 to the membrane of early LCVs. Herein, we demonstrate that the HAD domain (Lem4-N) is structurally similar to mouse MDP-1 phosphatase and displays phosphotyrosine phosphatase activity. Substrate specificity of Lem4 was probed using a Tyrosine Phosphatase Substrate Set, which contained a selection of 360 phosphopeptides derived from human phosphorylation sites. This assay allowed us to identify a consensus pTyr-containing motif. Based on the localization of Lem4 to lysosomes and to some extent to plasma membrane when expressed in human cells, we hypothesize that this protein is involved in protein-protein interactions with an LCV or plasma membrane-associated tyrosine-phosphorylated host target. Legionella pneumophila effector Lem4 is a membrane-associated protein tyrosine phosphatase.,Beyrakhova K, Li L, Xu C, Gagarinova A, Cygler M J Biol Chem. 2018 Jul 5. pii: RA118.003845. doi: 10.1074/jbc.RA118.003845. PMID:29976756 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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