View source for 4ows


==Anthranilate phosphoribosyl transferase from Mycobacterium tuberculosis in complex with 4-methylanthranilate, PRPP and Magnesium==
<StructureSection load='4ows' size='340' side='right'caption='[[4ows]], [[Resolution|resolution]] 2.43&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4ows]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4OWS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4OWS 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]] 2.43&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=4M0:2-AZANYL-4-METHYL-BENZOIC+ACID'>4M0</scene>, <scene name='pdbligand=IMD:IMIDAZOLE'>IMD</scene>, <scene name='pdbligand=POP:PYROPHOSPHATE+2-'>POP</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=4ows FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ows OCA], [https://pdbe.org/4ows PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ows RCSB], [https://www.ebi.ac.uk/pdbsum/4ows PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ows ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/TRPD_MYCTU TRPD_MYCTU] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Anthranilate phosphoribosyltransferase (AnPRT), required for the biosynthesis of tryptophan, is essential for the virulence of Mycobacterium tuberculosis (Mtb). AnPRT catalyses the Mg2+-dependent transfer of a phosphoribosyl group from 5'-phosphoribosyl 1'-pyrophosphate (PRPP) to anthranilate to form 5'-phosphoribosyl anthranilate (PRA). Mtb-AnPRT was shown to catalyse a sequential reaction and significant substrate inhibition by anthranilate was observed. Antimycobacterial fluoroanthranilates and methyl-substituted analogues were shown to act as alternative substrates for Mtb-AnPRT, producing the corresponding substituted PRA products. Structures of the enzyme complexed with anthranilate analogues reveal two distinct binding sites for anthranilate. One site is located over 8 A from PRPP at the entrance to a tunnel leading to the active site, whereas in the second, inner site anthranilate is adjacent to PRPP, in a catalytically relevant position. Soaking of the analogues for variable time periods provides evidence for anthranilate located at transient positions during transfer from the outer site to the inner catalytic site. PRPP and Mg2+ binding have been shown to be associated with the rearrangement of two flexible loops, which is required to complete the inner anthranilate binding site. It is proposed that anthranilate first binds to the outer site, providing an unusual mechanism for substrate capture and efficient transfer to the catalytic site following the binding of PRPP.

Alternative substrates reveal catalytic cycle and key binding events in the reaction catalysed by anthranilate phosphoribosyltransferase from Mycobacterium tuberculosis.,Cookson TV, Castell A, Bulloch EM, Evans GL, Short FL, Baker EN, Lott JS, Parker EJ Biochem J. 2014 Apr 9. PMID:24712732<ref>PMID:24712732</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4ows" style="background-color:#fffaf0;"></div>

==See Also==
*[[Phosphoribosyltransferase 3D structures|Phosphoribosyltransferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Castell A]]
[[Category: Cookson TVM]]
[[Category: Lott JS]]
[[Category: Short FL]]