OCA at 17:17, 10 February 2016

OCA — Wed, 10 Feb 2016 17:17:57 GMT

←Older revision		Revision as of 17:17, 10 February 2016
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-	'''~~Unreleased~~ structure'''	+	==Tryptophan Synthase from Salmonella typhimurium in complex with two molecules of N-(4'-trifluoromethoxybenzoyl)-2-amino-1-ethylphosphate (F6F) inhibitor in the alpha-site and a single F6F molecule in the beta-site at 1.54 Angstrom resolution.==
		+	<StructureSection load='4zqc' size='340' side='right' caption='[[4zqc]], [[Resolution\|resolution]] 1.54Å' scene=''>
		+	== Structural highlights ==
		+	<table><tr><td colspan='2'>[[4zqc]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4ZQC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4ZQC FirstGlance]. <br>
		+	</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand\|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=DMS:DIMETHYL+SULFOXIDE'>DMS</scene>, <scene name='pdbligand=F6F:2-{[4-(TRIFLUOROMETHOXY)BENZOYL]AMINO}ETHYL+DIHYDROGEN+PHOSPHATE'>F6F</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene></td></tr>
		+	<tr id='related'><td class="sblockLbl"><b>[[Related_structure\|Related:]]</b></td><td class="sblockDat">[[4wx2\|4wx2]], [[4y6g\|4y6g]], [[4kkx\|4kkx]], [[2clm\|2clm]], [[2clf\|2clf]], [[2cle\|2cle]]</td></tr>
		+	<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Tryptophan_synthase Tryptophan synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.2.1.20 4.2.1.20] </span></td></tr>
		+	<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4zqc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4zqc OCA], [http://pdbe.org/4zqc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4zqc RCSB], [http://www.ebi.ac.uk/pdbsum/4zqc PDBsum]</span></td></tr>
		+	</table>
		+	== Function ==
		+	[[http://www.uniprot.org/uniprot/TRPA_SALTY TRPA_SALTY]] The alpha subunit is responsible for the aldol cleavage of indoleglycerol phosphate to indole and glyceraldehyde 3-phosphate. [[http://www.uniprot.org/uniprot/TRPB_SALTY TRPB_SALTY]] The beta subunit is responsible for the synthesis of L-tryptophan from indole and L-serine.
		+	<div style="background-color:#fffaf0;">
		+	== Publication Abstract from PubMed ==
		+	Four new X-ray structures of tryptophan synthase (TS) crystallized with varying numbers of the amphipathic N-(4'-trifluoromethoxybenzoyl)-2-aminoethyl phosphate (F6) molecule are presented. These structures show one of the F6 ligands threaded into the tunnel from the beta-site and reveal a distinct hydrophobic region. Over this expanse, the interactions between F6 and the tunnel are primarily nonpolar, while the F6 phosphoryl group fits into a polar pocket of the beta-subunit active site. Further examination of TS structures reveals that one portion of the tunnel (T1) binds clusters of water molecules, whereas waters are not observed in the nonpolar F6 binding region of the tunnel (T2). MD simulation of another TS structure with an unobstructed tunnel also indicates the T2 region of the tunnel excludes water, consistent with a dewetted state that presents a significant barrier to the transfer of water into the closed beta-site. We conclude that hydrophobic molecules can freely diffuse between the alpha- and beta-sites via the tunnel, while water does not. We propose that exclusion of water serves to inhibit reaction of water with the alpha-aminoacrylate intermediate to form ammonium ion and pyruvate, a deleterious side reaction in the alphabeta-catalytic cycle. Finally, while most TS structures show betaPhe280 partially blocking the tunnel between the alpha- and beta-sites, new structures show an open tunnel, suggesting the flexibility of the betaPhe280 side chain. Flexible docking studies and MD simulations confirm that the dynamic behavior of betaPhe280 allows unhindered transfer of indole through the tunnel, therefore excluding a gating role for this residue.

-	~~The entry 4zqc is ON HOLD until May 08 2017~~	+	Visualizing the tunnel in tryptophan synthase with crystallography: Insights into a selective filter for accommodating indole and rejecting water.,Hilario E, Caulkins BG, Huang YM, You W, Chang CE, Mueller LJ, Dunn MF, Fan L Biochim Biophys Acta. 2016 Mar;1864(3):268-79. doi: 10.1016/j.bbapap.2015.12.006., Epub 2015 Dec 17. PMID:26708480<ref>PMID:26708480</ref>

-	~~Authors: Hilario~~, E.~~, Caulkins, B~~.~~G., Young, R.P., Dunn, M.F., Mueller, L.J., Fan, L~~.	+	From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
-		+	</div>
-	~~Description: Tryptophan Synthase from Salmonella typhimurium in complex with two molecules of N~~-~~(4'~~-~~trifluoromethoxybenzoyl)-2-amino-1-ethylphosphate (F6F) inhibitor in the alpha-site and a single F6F molecule in the beta-site at 1.54 Angstrom resolution.~~	+	<div class="pdbe-citations 4zqc" style="background-color:#fffaf0;"></div>
-	[[Category: ~~Unreleased Structures~~]]	+	== References ==
-	[[Category: ~~Mueller~~, ~~L.J~~]]	+	<references/>
-	[[Category: Dunn, M.F]]	+	__TOC__
-	~~[[Category: Caulkins, B.G~~]]	+	</StructureSection>
		+	[[Category: Tryptophan synthase]]
		+	[[Category: Caulkins, B G]]
		+	[[Category: Dunn, M F]]
	[[Category: Fan, L]]		[[Category: Fan, L]]
-	[[Category: Young, R.P]]
	[[Category: Hilario, E]]		[[Category: Hilario, E]]
		+	[[Category: Mueller, L J]]
		+	[[Category: Young, R P]]
		+	[[Category: Allosteric enzyme]]
		+	[[Category: Aromatic amino acid biosynthesis]]
		+	[[Category: F6f]]
		+	[[Category: Inhibitor]]
		+	[[Category: Lyase]]
		+	[[Category: Lyase-lyase inhibitor complex]]
		+	[[Category: Pyridoxal phosphate]]
		+	[[Category: Salmonella typhimurium]]
		+	[[Category: Tryptophan biosynthesis]]

OCA at 00:08, 1 December 2015

OCA — Tue, 01 Dec 2015 00:08:41 GMT

←Older revision		Revision as of 00:08, 1 December 2015
Line 7:		Line 7:
	Description: Tryptophan Synthase from Salmonella typhimurium in complex with two molecules of N-(4'-trifluoromethoxybenzoyl)-2-amino-1-ethylphosphate (F6F) inhibitor in the alpha-site and a single F6F molecule in the beta-site at 1.54 Angstrom resolution.		Description: Tryptophan Synthase from Salmonella typhimurium in complex with two molecules of N-(4'-trifluoromethoxybenzoyl)-2-amino-1-ethylphosphate (F6F) inhibitor in the alpha-site and a single F6F molecule in the beta-site at 1.54 Angstrom resolution.
	[[Category: Unreleased Structures]]		[[Category: Unreleased Structures]]
		+	[[Category: Mueller, L.J]]
	[[Category: Dunn, M.F]]		[[Category: Dunn, M.F]]
	[[Category: Caulkins, B.G]]		[[Category: Caulkins, B.G]]
	[[Category: Fan, L]]		[[Category: Fan, L]]
-	[[Category: Mueller, L.J]]
	[[Category: Young, R.P]]		[[Category: Young, R.P]]
	[[Category: Hilario, E]]		[[Category: Hilario, E]]

OCA at 14:36, 27 May 2015

OCA — Wed, 27 May 2015 14:36:41 GMT

←Older revision		Revision as of 14:36, 27 May 2015
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	'''Unreleased structure'''		'''Unreleased structure'''

-	The entry 4zqc is ON HOLD	+	The entry 4zqc is ON HOLD until May 08 2017

	Authors: Hilario, E., Caulkins, B.G., Young, R.P., Dunn, M.F., Mueller, L.J., Fan, L.		Authors: Hilario, E., Caulkins, B.G., Young, R.P., Dunn, M.F., Mueller, L.J., Fan, L.

OCA: Protected "4zqc" [edit=sysop:move=sysop]

OCA — Wed, 20 May 2015 11:00:28 GMT

Protected "4zqc" [edit=sysop:move=sysop]

←Older revision

Revision as of 11:00, 20 May 2015

OCA: New page: '''Unreleased structure''' The entry 4zqc is ON HOLD Authors: Hilario, E., Caulkins, B.G., Young, R.P., Dunn, M.F., Mueller, L.J., Fan, L. Description: Tryptophan Synthase from Salmone...

OCA — Wed, 20 May 2015 11:00:27 GMT

New page: '''Unreleased structure''' The entry 4zqc is ON HOLD Authors: Hilario, E., Caulkins, B.G., Young, R.P., Dunn, M.F., Mueller, L.J., Fan, L. Description: Tryptophan Synthase from Salmone...

New page

'''Unreleased structure'''

The entry 4zqc is ON HOLD

Authors: Hilario, E., Caulkins, B.G., Young, R.P., Dunn, M.F., Mueller, L.J., Fan, L.

Description: Tryptophan Synthase from Salmonella typhimurium in complex with two molecules of N-(4'-trifluoromethoxybenzoyl)-2-amino-1-ethylphosphate (F6F) inhibitor in the alpha-site and a single F6F molecule in the beta-site at 1.54 Angstrom resolution.
[[Category: Unreleased Structures]]
[[Category: Dunn, M.F]]
[[Category: Caulkins, B.G]]
[[Category: Fan, L]]
[[Category: Mueller, L.J]]
[[Category: Young, R.P]]
[[Category: Hilario, E]]

4zqc - Revision history

OCA at 17:17, 10 February 2016

OCA at 00:08, 1 December 2015

OCA at 14:36, 27 May 2015

OCA: Protected "4zqc" [edit=sysop:move=sysop]

OCA: New page: '''Unreleased structure''' The entry 4zqc is ON HOLD Authors: Hilario, E., Caulkins, B.G., Young, R.P., Dunn, M.F., Mueller, L.J., Fan, L. Description: Tryptophan Synthase from Salmone...