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==Crystal structure of the non-structural protein 1 N-terminal origin-recognition/nickase domain from the emerging human bocavirus==
==Crystal structure of the non-structural protein 1 N-terminal origin-recognition/nickase domain from the emerging human bocavirus==
<StructureSection load='4kw3' size='340' side='right' caption='[[4kw3]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
<StructureSection load='4kw3' size='340' side='right'caption='[[4kw3]], [[Resolution|resolution]] 2.70&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4kw3]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human_bocavirus Human bocavirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KW3 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4KW3 FirstGlance]. <br>
<table><tr><td colspan='2'>[[4kw3]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Human_bocavirus Human bocavirus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4KW3 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4KW3 FirstGlance]. <br>
</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">NS1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=329641 Human bocavirus])</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]] 2.7&#8491;</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=4kw3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kw3 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4kw3 RCSB], [http://www.ebi.ac.uk/pdbsum/4kw3 PDBsum]</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=4kw3 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4kw3 OCA], [https://pdbe.org/4kw3 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4kw3 RCSB], [https://www.ebi.ac.uk/pdbsum/4kw3 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4kw3 ProSAT]</span></td></tr>
</table>
</table>
<div style="background-color:#fffaf0;">
== Function ==
== Publication Abstract from PubMed ==
[https://www.uniprot.org/uniprot/NS1_HBOC1 NS1_HBOC1] Multifunctional protein which displays endonuclease and helicase activities required for initiating and directing viral DNA replication. Also plays a role in viral packaging and transactivation of several promoters. Binds site-specifically to 2-3 approximate tandem copies within the origins of replication (Ori), unwinds this hairpin region and nicks one DNA strand thereby initiating the rolling circle replication (RCR). Becomes covalently attached to the 5' end of the nick and provides a 3'OH for priming DNA synthesis. The helicase activity unwinds DNA in a 3'-5' direction on the longer strand. Participates in the transcriptional regulation of several promoters.[UniProtKB:P03134]
Human bocavirus is a newly identified, globally prevalent, parvovirus that is associated with respiratory infection in infant and young children. Parvoviruses encode a large non-structural protein 1 (NS1) that is essential for replication of the viral single-stranded DNA genome and DNA packaging and may play versatile roles in virus:host interaction. Here we report the structure of the human parvovirus NS1 N-terminal domain, the first for any autonomous parvovirus. The structure shows an overall fold that is canonical to the histidine-hydrophobic-histidine superfamily of nucleases, which integrates two distinct DNA-binding sites: a positively charged region mediated by a surface hairpin (residues 190-198) that is responsible for recognition of the viral origin of replication of the double-stranded DNA nature; and the nickase active site that binds to the single-stranded DNA substrate for site-specific cleavage. The structure reveals an acidic-residue-rich sub-domain that is present in bocavirus NS1 proteins but not in the NS1 orthologs in erythrovirus or dependovirus, which may mediate bocavirus-specific interaction with DNA or potential host factors. These results provide insights into recognition of the origin of replication and nicking of DNA during bocavirus genome replication. Mapping of variable amino acid residues of NS1s from four HBoV species onto the structure shows a scattered pattern, but the origin-recognition site and the nuclease active site are invariable, suggesting potential targets for antivirals against this clade of highly diverse human viruses.
 
Structure of the NS1 protein N-terminal origin-recognition/nickase domain from the emerging human bocavirus.,Tewary SK, Zhao H, Shen W, Qiu J, Tang L J Virol. 2013 Aug 21. PMID:23966383<ref>PMID:23966383</ref>
 
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
== References ==
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Human bocavirus]]
[[Category: Human bocavirus]]
[[Category: Tang, L]]
[[Category: Large Structures]]
[[Category: Tewary, S K]]
[[Category: Tang L]]
[[Category: Zhao, H]]
[[Category: Tewary SK]]
[[Category: Dna binding]]
[[Category: Zhao H]]
[[Category: Human bocavirus 1 ns1 n-terminal domain origin of replication binding protein with endonuclease activity]]
[[Category: Nuclease domain]]
[[Category: Viral protein]]

Latest revision as of 15:15, 1 March 2024

Crystal structure of the non-structural protein 1 N-terminal origin-recognition/nickase domain from the emerging human bocavirusCrystal structure of the non-structural protein 1 N-terminal origin-recognition/nickase domain from the emerging human bocavirus

Structural highlights

4kw3 is a 2 chain structure with sequence from Human bocavirus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2.7Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

NS1_HBOC1 Multifunctional protein which displays endonuclease and helicase activities required for initiating and directing viral DNA replication. Also plays a role in viral packaging and transactivation of several promoters. Binds site-specifically to 2-3 approximate tandem copies within the origins of replication (Ori), unwinds this hairpin region and nicks one DNA strand thereby initiating the rolling circle replication (RCR). Becomes covalently attached to the 5' end of the nick and provides a 3'OH for priming DNA synthesis. The helicase activity unwinds DNA in a 3'-5' direction on the longer strand. Participates in the transcriptional regulation of several promoters.[UniProtKB:P03134]

4kw3, resolution 2.70Å

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