5ax8

Recombinant expression, purification and preliminary crystallographic studies of the mature form of human mitochondrial aspartate aminotransferase

spinqualitylabelsall models 5ax8, resolution 2.99Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5ax8 is a 4 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.989Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function AATM_HUMAN Catalyzes the irreversible transamination of the L-tryptophan metabolite L-kynurenine to form kynurenic acid (KA). Plays a key role in amino acid metabolism. Important for metabolite exchange between mitochondria and cytosol. Facilitates cellular uptake of long-chain free fatty acids. Publication Abstract from PubMed Mitochondrial aspartate aminotransferase (mAspAT) was recognized as a moonlighting enzyme because it has not only aminotransferase activity but also a high-affinity long-chain fatty acids (LCFA) binding site. This enzyme plays a key role in amino acid metabolism, biosynthesis of kynurenic acid and transport of the LCFA. Therefore, it is important to study the structure-function relationships of human mAspAT protein. In this work, the mature form of human mAspAT was expressed to a high level in Escherichia coli periplasmic space using pET-22b vector, purified by a combination of immobilized metal-affinity chromatography and cation exchange chromatography. Optimal activity of the enzyme occurred at a temperature of 47.5 masculineC and a pH of 8.5. Crystals of human mAspAT were grown using the hanging-drop vapour diffusion method at 277K with 0.1 M HEPES pH 6.8 and 25%(v/v) Jeffamine((R)) ED-2001 pH 6.8. The crystals diffracted to 2.99 A and belonged to the space group P1 with the unit-cell parameters a =56.7, b = 76.1, c = 94.2 A, alpha =78.0, beta =85.6, gamma = 78.4 masculine. Elucidation of mAspAT structure can provide a molecular basis towards understanding catalysis mechanism and substrate binding site of enzyme. Recombinant expression, purification and crystallographic studies of the mature form of human mitochondrial aspartate aminotransferase.,Jiang X, Wang J, Chang H, Zhou Y Biosci Trends. 2016 Mar 10;10(1):79-84. doi: 10.5582/bst.2015.01150. Epub 2016, Feb 22. PMID:26902786 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aspartate aminotransferase 3D structures

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