View source for 1hpc


==REFINED STRUCTURES AT 2 ANGSTROMS AND 2.2 ANGSTROMS OF THE TWO FORMS OF THE H-PROTEIN, A LIPOAMIDE-CONTAINING PROTEIN OF THE GLYCINE DECARBOXYLASE==
<StructureSection load='1hpc' size='340' side='right'caption='[[1hpc]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1hpc]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Pisum_sativum Pisum sativum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1HPC OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1HPC 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&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=LPA:LIPOIC+ACID'>LPA</scene>, <scene name='pdbligand=LPB:5-[(3S)-1,2-DITHIOLAN-3-YL]PENTANOIC+ACID'>LPB</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=1hpc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hpc OCA], [https://pdbe.org/1hpc PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1hpc RCSB], [https://www.ebi.ac.uk/pdbsum/1hpc PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1hpc ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/GCSH_PEA GCSH_PEA] The glycine cleavage system catalyzes the degradation of glycine. The H protein shuttles the methylamine group of glycine from the P protein to the T protein.
== 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/hp/1hpc_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=1hpc ConSurf].
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== Publication Abstract from PubMed ==
H-protein, a 14 kDa lipoic acid-containing protein is a component of the glycine decarboxylase complex. This complex which consists of four protein components (P-, H-, T- and L-protein) catalyzes the oxidative decarboxylation of glycine. The mechanistic heart of the complex is provided by the lipoic acid attached to a lysine residue of the H-protein. It undergoes a cycle of transformations, i.e. reductive methylamination, methylamine transfer, and electron transfer. We present details of the crystal structures of the H-protein, in its two forms, H-Pro(Ox) with oxidized lipoamide and H-Pro(Met) with methylamine-loaded lipoamide. X-ray diffraction data were collected from crystals of H-Pro(Ox) to 2 and H-Pro(Met) to 2.2 A resolution. The final R-factor value for the H-Pro(Ox) is 18.5% for data with F &gt; 2sigma. in the range of 8.0-2.0 A resolution. The refinement confirmed our previous model, refined to 2.6 A, of a beta-fold sandwich structure with two beta-sheets. The lipoamide arm attached to Lys63, located in the loop of a hairpin conformation, is clearly visible at the surface of the protein. The H-Pro(Met) has been crystallized in orthorhombic and monoclinic forms and the structures were solved by molecular replacement, starting from the H-Pro(Ox) model. The orthorhombic structure has been refined with a final R-factor value of 18.5% for data with F &gt; 2sigma in the range of 8.0-2.2 A resolution. The structure of the monoclinic form has been refined with a final R-factor value of 17.5% for data with F &gt; 2sigma in the range of 15.0-3.0 A. In these two structures which have similar packing, the protein conformation is identical to the conformation found in the H-Pro(Ox). The main change lies in the position of the lipoamide group which has moved significantly when loaded with methylamine. In this case the methylamine-lipoamide group is tucked into a cleft at the surface of the protein where it is stabilized by hydrogen bonds and hydrophobic contacts. Thus, it is totally protected and not free to move in aqueous solvent. In addition, the H-protein presents some sequence and structural analogies with other lipoate- and biotin-containing proteins and also with proteins of the phosphoenolpyruvate:sugar phosphotransferase system.

Refined structures at 2 and 2.2 A resolution of two forms of the H-protein, a lipoamide-containing protein of the glycine decarboxylase complex.,Pares S, Cohen-Addad C, Sieker LC, Neuburger M, Douce R Acta Crystallogr D Biol Crystallogr. 1995 Nov 1;51(Pt 6):1041-51. PMID:15299773<ref>PMID:15299773</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pisum sativum]]
[[Category: Cohen-Addad C]]
[[Category: Douce R]]
[[Category: Neuburger M]]
[[Category: Pares S]]
[[Category: Sieker L]]