View source for 3pc4


==Full length structure of cystathionine beta-synthase from Drosophila in complex with serine==
<StructureSection load='3pc4' size='340' side='right'caption='[[3pc4]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3pc4]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3PC4 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3PC4 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]] 1.7&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=HEM:PROTOPORPHYRIN+IX+CONTAINING+FE'>HEM</scene>, <scene name='pdbligand=KOU:(E)-N-({3-HYDROXY-2-METHYL-5-[(PHOSPHONOOXY)METHYL]PYRIDIN-4-YL}METHYLIDENE)-L-SERINE'>KOU</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=3pc4 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3pc4 OCA], [https://pdbe.org/3pc4 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3pc4 RCSB], [https://www.ebi.ac.uk/pdbsum/3pc4 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3pc4 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q9VRD9_DROME Q9VRD9_DROME] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The catalytic potential for H(2)S biogenesis and homocysteine clearance converge at the active site of cystathionine beta-synthase (CBS), a pyridoxal phosphate-dependent enzyme. CBS catalyzes beta-replacement reactions of either serine or cysteine by homocysteine to give cystathionine and water or H(2)S, respectively. In this study, high-resolution structures of the full-length enzyme from Drosophila in which a carbanion (1.70 A) and an aminoacrylate intermediate (1.55 A) have been captured are reported. Electrostatic stabilization of the zwitterionic carbanion intermediate is afforded by the close positioning of an active site lysine residue that is initially used for Schiff base formation in the internal aldimine and later as a general base. Additional stabilizing interactions between active site residues and the catalytic intermediates are observed. Furthermore, the structure of the regulatory "energy-sensing" CBS domains, named after this protein, suggests a mechanism for allosteric activation by S-adenosylmethionine.

Structural basis for substrate activation and regulation by cystathionine beta-synthase (CBS) domains in cystathionine {beta}-synthase.,Koutmos M, Kabil O, Smith JL, Banerjee R Proc Natl Acad Sci U S A. 2010 Nov 16. PMID:21081698<ref>PMID:21081698</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3pc4" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cystathionine ÃÂ²-synthase 3D structures|Cystathionine ÃÂ²-synthase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Drosophila melanogaster]]
[[Category: Large Structures]]
[[Category: Koutmos M]]
[[Category: Smith JL]]