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1b9i

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[[Image:1b9i.png|left|200px]]
 
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{{STRUCTURE_1b9i| PDB=1b9i | SCENE= }}
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==CRYSTAL STRUCTURE OF 3-AMINO-5-HYDROXYBENZOIC ACID (AHBA) SYNTHASE==
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<StructureSection load='1b9i' size='340' side='right'caption='[[1b9i]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1b9i]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Amycolatopsis_mediterranei Amycolatopsis mediterranei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B9I OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1B9I FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PXG:3-[O-PHOSPHONOPYRIDOXYL]--AMINO-BENZOIC+ACID'>PXG</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1b9i FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1b9i OCA], [https://pdbe.org/1b9i PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1b9i RCSB], [https://www.ebi.ac.uk/pdbsum/1b9i PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1b9i ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/RIFK_AMYMS RIFK_AMYMS] Catalyzes the dehydration and aromatization of 5-amino-5-deoxy-3-dehydroshikimate (aminoDHS) to 3-amino-5-hydroxybenzoate (AHBA), a compound that then serves as the starter unit for the assembly of a polyketide during the biosynthesis of rifamycin B and other ansamycin antibiotics. Can not utilize 5-deoxy-5-amino-3-dehydroquinate (aminoDHQ), 5-deoxy-5-aminoshikimate (aminoSA), quinate, 3-dehydroquinate, or 3-dehydroshikimate (DHS) as substrate.<ref>PMID:9497318</ref> In a complex with RifL, RifK may have a second function in the AHBA pathway, acting as a transaminase introducing the nitrogen into the first pathway intermediate, UDP-3-keto-D-glucose, to give UDP-kanosamine. Appears to use glutamine as the nitrogen donor; NH(4)+ or asparagine are 30% less effective as nitrogen donors and neither glutamate nor aspartate show activity.<ref>PMID:9497318</ref>
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/b9/1b9i_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1b9i ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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The biosynthesis of ansamycin antibiotics, including rifamycin B, involves the synthesis of an aromatic precursor, 3-amino-5-hydroxybenzoic acid (AHBA), which serves as starter for the assembly of the antibiotics' polyketide backbone. The terminal enzyme of AHBA formation, AHBA synthase, is a dimeric, pyridoxal 5'-phosphate (PLP) dependent enzyme with pronounced sequence homology to a number of PLP enzymes involved in the biosynthesis of antibiotic sugar moieties. The structure of AHBA synthase from Amycolatopsis mediterranei has been determined to 2.0 A resolution, with bound cofactor, PLP, and in a complex with PLP and an inhibitor (gabaculine). The overall fold of AHBA synthase is similar to that of the aspartate aminotransferase family of PLP-dependent enzymes, with a large domain containing a seven-stranded beta-sheet surrounded by alpha-helices and a smaller domain consisting of a four-stranded antiparallel beta-sheet and four alpha-helices. The uninhibited form of the enzyme shows the cofactor covalently linked to Lys188 in an internal aldimine linkage. On binding the inhibitor, gabaculine, the internal aldimine linkage is broken, and a covalent bond is observed between the cofactor and inhibitor. The active site is composed of residues from two subunits of AHBA synthase, indicating that AHBA synthase is active as a dimer.
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===CRYSTAL STRUCTURE OF 3-AMINO-5-HYDROXYBENZOIC ACID (AHBA) SYNTHASE===
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Crystal structure of 3-amino-5-hydroxybenzoic acid (AHBA) synthase.,Eads JC, Beeby M, Scapin G, Yu TW, Floss HG Biochemistry. 1999 Aug 3;38(31):9840-9. PMID:10433690<ref>PMID:10433690</ref>
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{{ABSTRACT_PUBMED_10433690}}
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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==About this Structure==
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<div class="pdbe-citations 1b9i" style="background-color:#fffaf0;"></div>
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[[1b9i]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Amycolatopsis_mediterranei Amycolatopsis mediterranei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1B9I OCA].
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== References ==
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<references/>
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==Reference==
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__TOC__
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<ref group="xtra">PMID:010433690</ref><references group="xtra"/>
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</StructureSection>
[[Category: Amycolatopsis mediterranei]]
[[Category: Amycolatopsis mediterranei]]
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[[Category: Beeby, M.]]
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[[Category: Large Structures]]
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[[Category: Eads, J C.]]
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[[Category: Beeby M]]
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[[Category: Floss, H G.]]
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[[Category: Eads JC]]
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[[Category: Scapin, G.]]
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[[Category: Floss HG]]
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[[Category: Yu, T W.]]
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[[Category: Scapin G]]
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[[Category: Yu T-W]]

Current revision

CRYSTAL STRUCTURE OF 3-AMINO-5-HYDROXYBENZOIC ACID (AHBA) SYNTHASE

PDB ID 1b9i

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