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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[1ak0]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Penicillium_citrinum Penicillium citrinum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AK0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AK0 FirstGlance]. <br>
<table><tr><td colspan='2'>[[1ak0]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Penicillium_citrinum Penicillium citrinum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AK0 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1AK0 FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADS:ADENOSINE-5-(DITHIO)PHOSPHATE'>ADS</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=THS:THYMIDINE-5-(DITHIO)PHOSPHATE'>THS</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.8&#8491;</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[https://en.wikipedia.org/wiki/Aspergillus_nuclease_S(1) Aspergillus nuclease S(1)], with EC number [https://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.1.30.1 3.1.30.1] </span></td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ADS:ADENOSINE-5-(DITHIO)PHOSPHATE'>ADS</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=THS:THYMIDINE-5-(DITHIO)PHOSPHATE'>THS</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=1ak0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ak0 OCA], [https://pdbe.org/1ak0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ak0 RCSB], [https://www.ebi.ac.uk/pdbsum/1ak0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ak0 ProSAT]</span></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=1ak0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ak0 OCA], [https://pdbe.org/1ak0 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1ak0 RCSB], [https://www.ebi.ac.uk/pdbsum/1ak0 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1ak0 ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/NUP1_PENCI NUP1_PENCI]] Hydrolyzes only single-stranded DNA and RNA without apparent specificity for bases.  
[https://www.uniprot.org/uniprot/NUP1_PENCI NUP1_PENCI] Hydrolyzes only single-stranded DNA and RNA without apparent specificity for bases.
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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</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=1ak0 ConSurf].
</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=1ak0 ConSurf].
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== Publication Abstract from PubMed ==
The reaction mechanism of nuclease P1 from Penicillium citrinum has been investigated using single-stranded dithiophosphorylated di-, tetra-, and hexanucleotides as substrate analogs. The complexes crystallize in tetragonal and orthorhombic space groups and have been solved by molecular replacement. The high resolution structures give a clear picture of base recognition by P1 nuclease at its two nucleotide-binding sites, especially the 1.8 A structure of a P1-tetranucleotide complex which can be considered a P1-product complex. The observed binding modes are in agreement with a catalytic mechanism where the two closely spaced zinc ions activate the attacking water while the third, more exposed zinc ion stabilizes the leaving 03' oxyanion. Stacking as well as hydrogen bonding interactions with the base 5' to the cleaved phosphodiester bond are important elements of substrate binding and recognition. Modelling of a productive P1-substrate complex based on the solved structures suggests steric hindrance as the likely reason for the resistance of Rp-phosphorothioates and phosphorodithioates. Differences with the highly homologous nuclease S1 from Aspergillus oryzae are discussed.
Recognition of single-stranded DNA by nuclease P1: high resolution crystal structures of complexes with substrate analogs.,Romier C, Dominguez R, Lahm A, Dahl O, Suck D Proteins. 1998 Sep 1;32(4):414-24. PMID:9726413<ref>PMID:9726413</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1ak0" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Penicillium citrinum]]
[[Category: Penicillium citrinum]]
[[Category: Romier, C]]
[[Category: Romier C]]
[[Category: Suck, D]]
[[Category: Suck D]]
[[Category: Endonuclease]]
[[Category: Glycosylated protein]]
[[Category: P1 nuclease]]
[[Category: Reaction mechanism]]
[[Category: Thiophosphorylated oligonucleotide]]

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