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==X-RAY STRUCTURE OF A POKEWEED ANTIVIRAL PROTEIN, CODED BY A NEW GENOMIC CLONE, AT 0.23 NM RESOLUTION. A MODEL STRUCTURE PROVIDES A SUITABLE ELECTROSTATIC FIELD FOR SUBSTRATE BINDING.==
<StructureSection load='1apa' size='340' side='right'caption='[[1apa]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1apa]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Phytolacca_americana Phytolacca americana]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1APA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1APA 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]] 2.3&#8491;</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=1apa FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1apa OCA], [https://pdbe.org/1apa PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1apa RCSB], [https://www.ebi.ac.uk/pdbsum/1apa PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1apa ProSAT]</span></td></tr>
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== Function ==
[https://www.uniprot.org/uniprot/RIPA_PHYAM RIPA_PHYAM] Inhibits viral infection of plants, and protein synthesis in vitro. Has also been shown to inhibit the replication of mammalian viruses. The protein may provide a means of cellular suicide upon invasion by a virus.
== 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/ap/1apa_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=1apa ConSurf].
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== Publication Abstract from PubMed ==
We have determined the crystal structure of alpha-pokeweed antiviral protein, a member of ribosome-inactivating proteins, at 0.23 nm resolution, by the molecular-replacement method. The crystals belong to the space group P2(1)2(1)2 with unit-cell dimensions a = 4.71, b = 11.63 and c = 4.96 nm, and contain one protein molecule/asymmetric unit based on a crystal volume/unit protein molecular mass of 2.1 x 10(-3) nm3/Da. The crystallographic residual value was reduced to 17.2% (0.6-0.23 nm resolution) with root-mean-square deviations in bond lengths of 1.9 pm and bond angles of 2.2 degrees. The C alpha-C alpha distance map shows that alpha-pokeweed antiviral protein is composed of three modules, the N-terminal (Ala1-Leu76), the central (Tyr77-Lys185) and the C-terminal (Tyr186-Thr266) modules. The substrate-binding site is formed as a cleft between the central and C-terminal modules and all the active residues exist on the central module. The electrostatic potential around the substrate-binding site shows that the central and C-terminal module sides of this cleft have a negatively and a positively charged region, respectively. This charge distribution in the protein seems to provide a suitable interaction with the substrate rRNA.

X-ray structure of a pokeweed antiviral protein, coded by a new genomic clone, at 0.23 nm resolution. A model structure provides a suitable electrostatic field for substrate binding.,Ago H, Kataoka J, Tsuge H, Habuka N, Inagaki E, Noma M, Miyano M Eur J Biochem. 1994 Oct 1;225(1):369-74. PMID:7925458<ref>PMID:7925458</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Ribosome inactivating protein 3D structures|Ribosome inactivating protein 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Phytolacca americana]]
[[Category: Ago H]]
[[Category: Habuka N]]
[[Category: Inagaki E]]
[[Category: Kataoka J]]
[[Category: Miyano M]]
[[Category: Noma M]]
[[Category: Tsuge H]]