1fx4

<table><tr><td colspan='2'>[[1fx4]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Trypanosoma_(trypanozoon)_brucei Trypanosoma (trypanozoon) brucei]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1FX4 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1FX4 FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></td></tr>

<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1fx2|1fx2]]</td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Adenylate_cyclase Adenylate cyclase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.6.1.1 4.6.1.1] </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=1fx4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fx4 OCA], [http://pdbe.org/1fx4 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1fx4 RCSB], [http://www.ebi.ac.uk/pdbsum/1fx4 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1fx4 ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/CY43_TRYBB CY43_TRYBB]] Could act as a receptor for an unknown ligand.

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== Publication Abstract from PubMed ==

Cyclic AMP is a major trigger of the differentiation process of Trypanosoma brucei, a bloodstream parasite causing sleeping sickness. Its generation in trypanosomes is accomplished by a unique battery of membrane-bound adenylate cyclases (ACs). We have determined the high-resolution X-ray structures of the catalytic domains of two trypanosomal ACs (tACs), GRESAG4.1 and GRESAG4.3. The tAC domains are structurally highly related to the AC domains of higher eukaryotes, but also comprise a highly conserved structural element near the active site, the Delta-subdomain. A cavity below the Delta-subdomain might correspond to an allosteric regulator site as indicated by the stereospecific binding of a single (2S,3S)-1,4- dimercapto-2,3-butanediol molecule. In three different crystal forms, the tAC domains are exclusively observed in a monomeric, catalytically inactive state. Biochemical analysis and the mutagenesis profile of GRESAG4.1 confirmed a common catalytic mechanism of tACs that involves transient dimerization of the AC domain. A low dimerization tendency might play a regulatory role in T. brucei if the activation of tACs is similarly driven by ligand-induced dimerization as in membrane-bound guanylate cyclases.

Structural analysis of adenylate cyclases from Trypanosoma brucei in their monomeric state.,Bieger B, Essen LO EMBO J. 2001 Feb 1;20(3):433-45. PMID:11157750<ref>PMID:11157750</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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<div class="pdbe-citations 1fx4" style="background-color:#fffaf0;"></div>

== References ==

<references/>

[[Category: Adenylate cyclase]]

[[Category: Bieger, B]]

[[Category: Essen, L O]]

[[Category: Adenylyl cyclase]]

[[Category: Trypanosome]]