View source for 1qj3


==Crystal structure of 7,8-diaminopelargonic acid synthase in complex with 7-keto-8-aminopelargonic acid==
<StructureSection load='1qj3' size='340' side='right'caption='[[1qj3]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qj3]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_BL21(DE3) Escherichia coli BL21(DE3)]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QJ3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QJ3 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=KAP:7-KETO-8-AMINOPELARGONIC+ACID'>KAP</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1qj3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qj3 OCA], [https://pdbe.org/1qj3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qj3 RCSB], [https://www.ebi.ac.uk/pdbsum/1qj3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qj3 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/BIOA_ECOLI BIOA_ECOLI] Catalyzes the transfer of the alpha-amino group from S-adenosyl-L-methionine (SAM) to 7-keto-8-aminopelargonic acid (KAPA) to form 7,8-diaminopelargonic acid (DAPA). It is the only animotransferase known to utilize SAM as an amino donor.<ref>PMID:1092681</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qj/1qj3_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</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=1qj3 ConSurf].
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== Publication Abstract from PubMed ==
The three-dimensional structure of diaminopelargonic acid synthase, a vitamin B6-dependent enzyme in the pathway of the biosynthesis of biotin, has been determined to 1.8 A resolution by X-ray crystallography. The structure was solved by multi-wavelength anomalous diffraction techniques using a crystal derivatized with mercury ions. The protein model has been refined to a crystallographic R -value of 17.5% (R -free 22.6%). Each enzyme subunit consists of two domains, a large domain (residues 50-329) containing a seven-stranded predominantly parallel beta-sheet, surrounded by alpha-helices, and a small domain comprising residues 1-49 and 330-429. Two subunits, related by a non-crystallographic dyad in the crystals, form the homodimeric molecule, which contains two equal active sites. Pyridoxal-5'-phosphate is bound in a cleft formed by both domains of one subunit and the large domain of the second subunit. The cofactor is anchored to the enzyme by a covalent linkage to the side-chain of the invariant residue Lys274. The phosphate group interacts with main-chain nitrogen atoms and the side-chain of Ser113, located at the N terminus of an alpha-helix. The pyridine nitrogen forms a hydrogen bond to the side-chain of the invariant residue Asp245. Electron density corresponding to a metal ion, most likely Na(+), was found in a tight turn at the surface of the enzyme. Structure analysis reveals that diaminopelargonic acid synthase belongs to the family of vitamin B6-dependent aminotransferases with the same fold as originally observed in aspartate aminotransferase. A multiple structure alignment of enzymes in this family indicated that they form at least six different subclasses. Striking differences in the fold of the N-terminal part of the polypeptide chain are one of the hallmarks of these subclasses. Diaminopelargonic acid synthase is a member of the aminotransferase subclass III. From the structure of the non-productive complex of the holoenzyme with the substrate 7-keto-8-aminopelargonic acid the location of the active site and residues involved in substrate binding have been identified.

Crystal structure of diaminopelargonic acid synthase: evolutionary relationships between pyridoxal-5'-phosphate-dependent enzymes.,Kack H, Sandmark J, Gibson K, Schneider G, Lindqvist Y J Mol Biol. 1999 Aug 27;291(4):857-76. PMID:10452893<ref>PMID:10452893</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[7%2C8-diaminopelargonic acid synthase|7%2C8-diaminopelargonic acid synthase]]
*[[7%2C8-diaminopelargonic acid synthase 3D structures|7%2C8-diaminopelargonic acid synthase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Gibson KJ]]
[[Category: Kaeck H]]
[[Category: Lindqvist Y]]
[[Category: Sandmark J]]
[[Category: Schneider G]]