4eqg

Crystal structure of histidine triad nucleotide-binding protein 1 (HINT1) from human complexed with Ala-AMS

spinqualitylabelsall models 4eqg, resolution 1.52Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4eqg is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: A5A, EPE Related: 4eqe, 4eqh Gene: HINT1, HINT (Homo sapiens) Resources: FirstGlance, OCA, RCSB, PDBsum Function [HINT1_HUMAN] Hydrolyzes adenosine 5'-monophosphoramidate substrates such as AMP-morpholidate, AMP-N-alanine methyl ester, AMP-alpha-acetyl lysine methyl ester and AMP-NH2 (By similarity). Publication Abstract from PubMed Human Hint1 suppresses specific gene transcription by interacting with the transcription factor MITF in mast cells. Hint1 activity is connected to lysyl-tRNA synthetase (LysRS), a member of the universal aminoacyl tRNA synthetase family that catalyzes specific aminoacylation of their cognate tRNAs, through an aminoacyl adenylate (aa-AMP) intermediate. During immune activation, LysRS produces a side-product diadenosine tetraphosphate (Ap(4)A) from the condensation of Lys-AMP with ATP. The pleiotropic signaling molecule Ap(4)A then binds Hint1 to promote activation of MITF-target gene transcription. Earlier work showed that Hint1 can also bind and hydrolyze Lys-AMP, possibly to constrain Ap(4)A production. Because Ap(4)A can result from condensation of other aa-AMP's with ATP, the specificity of the Hint1 aa-AMP-hydrolysis activity is of interest. Here we show that Hint1 has broad specificity for adenylate hydrolysis, whose structural basis we revealed through high-resolution structures of Hint1 in complex with three different aa-AMP analogues. Hint1 recognizes only the common main chain of the aminoacyl moiety, and has no contact with the aa side chain. The alpha-amino group is anchored by a cation-pi interaction with Trp123 at the C-terminus of Hint1. These results reveal the structural basis for the remarkable adenylate surveillance activity of Hint1, to potentially control Ap(4)A levels in the cell. Side Chain Independent Recognition of Aminoacyl Adenylates by the Hint1 Transcription Suppressor.,Wang J, Fang P, Schimmel P, Guo M J Phys Chem B. 2012 Mar 2. PMID:22329685 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Histidine triad nucleotide-binding protein

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