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| | ==Solution structure of IPI*== | | ==Solution structure of IPI*== |
| - | <StructureSection load='2jub' size='340' side='right'caption='[[2jub]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''> | + | <StructureSection load='2jub' size='340' side='right'caption='[[2jub]]' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[2jub]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bpt4 Bpt4]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JUB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2JUB FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[2jub]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_virus_T4 Escherichia virus T4]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2JUB OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2JUB FirstGlance]. <br> |
| - | </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ipi1, ipi ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10665 BPT4])</td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=2jub FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2jub OCA], [https://pdbe.org/2jub PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2jub RCSB], [https://www.ebi.ac.uk/pdbsum/2jub PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2jub 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=2jub FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2jub OCA], [https://pdbe.org/2jub PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2jub RCSB], [https://www.ebi.ac.uk/pdbsum/2jub PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2jub ProSAT]</span></td></tr> |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[https://www.uniprot.org/uniprot/IPI1_BPT4 IPI1_BPT4]] Internal protein I is one of four proteins in a complex that functions in bacteriophage head maturation.
| + | [https://www.uniprot.org/uniprot/IPI1_BPT4 IPI1_BPT4] Internal protein I is one of four proteins in a complex that functions in bacteriophage head maturation. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Bpt4]] | + | [[Category: Escherichia virus T4]] |
| | [[Category: Large Structures]] | | [[Category: Large Structures]] |
| - | [[Category: Black, L W]] | + | [[Category: Black LW]] |
| - | [[Category: Rifat, D]] | + | [[Category: Rifat D]] |
| - | [[Category: Varney, K M]] | + | [[Category: Varney KM]] |
| - | [[Category: Weber, D J]] | + | [[Category: Weber DJ]] |
| - | [[Category: Wright, N T]] | + | [[Category: Wright NT]] |
| - | [[Category: Endonuclease inhibitor]]
| + | |
| - | [[Category: Ipi*]]
| + | |
| - | [[Category: Solution]]
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| - | [[Category: T4 phage]]
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| Structural highlights
Function
IPI1_BPT4 Internal protein I is one of four proteins in a complex that functions in bacteriophage head maturation.
Publication Abstract from PubMed
Phage T4 protects its DNA from the two-gene-encoded gmrS/gmrD (glucose-modified hydroxymethylcytosine restriction endonuclease) CT of pathogenic Escherichia coli, CT596, by injecting several hundred copies of the 76-amino-acid-residue nuclease inhibitor, IPI*, into the infected host. Here, the three-dimensional solution structure of mature IPI* is reported as determined by nuclear magnetic resonance techniques using 1290 experimental nuclear Overhauser effect and dipolar coupling constraints ( approximately 17 constraints per residue). Close examination of this oblate-shaped protein structure reveals a novel fold consisting of two small beta-sheets (beta1: B1 and B2; beta2: B3-B5) flanked at the N- and C-termini by alpha-helices (H1 and H2). Such a fold is very compact in shape and allows ejection of IPI* through the narrow 30-A portal and tail tube apertures of the virion without unfolding. Structural and dynamic measurements identify an exposed hydrophobic knob that is a putative gmrS/gmrD-binding site. A single gene from the uropathogenic E. coli UT189, which codes for a gmrS/gmrD-like UT fusion enzyme (with approximately 90% identity to the heterodimeric CT enzyme), has evolved IPI* inhibitor immunity. Analysis of the gmrS/gmrD restriction endonuclease enzyme family and its IPI* family phage antagonists reveals an evolutionary pathway that has elaborated a surprisingly diverse and specifically fitted set of coevolving attack and defense structures.
Restriction endonuclease inhibitor IPI* of bacteriophage T4: a novel structure for a dedicated target.,Rifat D, Wright NT, Varney KM, Weber DJ, Black LW J Mol Biol. 2008 Jan 18;375(3):720-34. Epub 2007 Nov 1. PMID:18037438[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Rifat D, Wright NT, Varney KM, Weber DJ, Black LW. Restriction endonuclease inhibitor IPI* of bacteriophage T4: a novel structure for a dedicated target. J Mol Biol. 2008 Jan 18;375(3):720-34. Epub 2007 Nov 1. PMID:18037438 doi:http://dx.doi.org/S0022-2836(07)01423-4
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