3cbf | pdb_00003cbf

Crystal structure of LysN, alpha-aminoadipate aminotransferase, from Thermus thermophilus HB27

spinqualitylabelsall models 3cbf, resolution 1.67Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3cbf is a 2 chain structure with sequence from "flavobacterium_thermophilum"_yoshida_and_oshima_1971 "flavobacterium thermophilum" yoshida and oshima 1971. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: N5F Related: 2dtv, 2egy, 2z1y Gene: lysN ("Flavobacterium thermophilum" Yoshida and Oshima 1971) Activity: 2-aminoadipate transaminase, with EC number 2.6.1.39 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [LYSN_THET2] Catalyzes the transfer of an amino group between 2-oxoadipate (2-OA) and glutamate (Glu) to yield alpha-aminodipate (AAA). It can also transaminate glutamate, leucine, and aromatic amino acids. It also contributes in the biosynthesis of other amino acids such as leucine. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed alpha-Aminoadipate aminotransferase (AAA-AT), a homolog of mammalian kynurenine aminotransferase II (Kat II), transfers an amino group to 2-oxoadipate to yield alpha-aminoadipate in lysine biosynthesis through the alpha-aminoadipate pathway in Thermus thermophilus. AAA-AT catalyzes transamination against various substrates, including AAA, glutamate, leucine, and aromatic amino acids. To elucidate the structural change for recognition of various substrates, we determined crystal structures of AAA-AT in four forms: with pyridoxal 5'-phosphate (PLP) (PLP complex), with PLP and leucine (PLP/Leu complex), with N-phosphopyridoxyl-leucine (PPL) (PPL complex), and with N-phosphopyridoxyl-alpha-aminoadipate (PPA) at 2.67, 2.26, 1.75, and 1.67 A resolution, respectively. The PLP complex is in an open state, whereas PLP/Leu, PPL, and PPA complexes are in closed states with maximal displacement (over 7 A) of the alpha2 helix and the beta1 strand in the small domain to cover the active site, indicating that conformational change is induced by substrate binding. In PPL and PLP/Leu complexes, several hydrophobic residues on the alpha2 helix recognize the hydrophobic side chain of the bound leucine moiety whereas, in the PPA complex, the alpha2 helix rotates to place the guanidium moiety of Arg23 on the helix at the appropriate position to interact with the carboxyl side chain of the AAA moiety. These results indicate that AAA-AT can recognize various kinds of substrates using the mobile alpha2 helix. The crystal structures and site-directed mutagenesis revealed that intersubunit-electrostatic interactions contribute to the elevated thermostability of this enzyme. Proteins 2008. (c) 2008 Wiley-Liss, Inc. Mechanism for multiple-substrates recognition of alpha-aminoadipate aminotransferase from Thermus thermophilus.,Tomita T, Miyagawa T, Miyazaki T, Fushinobu S, Kuzuyama T, Nishiyama M Proteins. 2008 Sep 2. PMID:18831049 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Aminotransferase

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