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[[Image:1qa1.gif|left|200px]]


{{Structure
==TAILSPIKE PROTEIN, MUTANT V331G==
|PDB= 1qa1 |SIZE=350|CAPTION= <scene name='initialview01'>1qa1</scene>, resolution 2.0&Aring;
<StructureSection load='1qa1' size='340' side='right'caption='[[1qa1]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
|SITE=  
== Structural highlights ==
|LIGAND=  
<table><tr><td colspan='2'>[[1qa1]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Salmonella_virus_P22 Salmonella virus P22]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QA1 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QA1 FirstGlance]. <br>
|ACTIVITY=  
</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>
|GENE=  
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1qa1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qa1 OCA], [https://pdbe.org/1qa1 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qa1 RCSB], [https://www.ebi.ac.uk/pdbsum/1qa1 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qa1 ProSAT]</span></td></tr>
}}
</table>
== Function ==
[https://www.uniprot.org/uniprot/FIBER_BPP22 FIBER_BPP22] Structural component of the short non-contractile tail. The tail comprises six fibers that mediate primary attachment to the host cell lipopolysaccharides (LPS) and display endorhamnosidase enzymatic activity, hydrolyzing the alpha-1,3-O-glycosidic linkage between rhamnose and galactose of the O-antigen polysaccharide. Digestion of the LPS brings the capsid near the cell outer membrane.<ref>PMID:12837775</ref> <ref>PMID:20817910</ref>


'''TAILSPIKE PROTEIN, MUTANT V331G'''
==See Also==
 
*[[Tailspike protein 3D structures|Tailspike protein 3D structures]]
 
== References ==
==Overview==
<references/>
Four previously isolated mutations in Salmonella phage P22 tailspike protein were used to study the relationship between protein stability, folding, and function. Tailspike protein binds and hydrolyzes the repetitive O-antigen structure in Salmonella lipopolysaccharide. Four mutations (V331G, V331A, A334V, A334I) are known to increase the folding efficiency, and two of them (at position 331) also increase the thermal stability of the protein. Octasaccharides comprising two repeating units of the O-antigens from two different Salmonella strains were employed to analyze the receptor binding function of the mutant proteins. Their endorhamnosidase enzymatic activity was assayed with the aid of a fluorescence-labeled dodecasaccharide. Both V331A and V331G were found to strongly affect O-antigen binding. Octasaccharide binding affinities of the mutant proteins are reduced tenfold and 200-fold, corresponding to a loss of 17% and 36% of the standard free energy of binding, respectively. Both mutations at position 334 affected O-antigen binding only slightly (DeltaDeltaG(0)B approximately 1 kJ/mol), but these mutations reduce the thermal stability of the protein. The observed effects on the endoglycosidase activity are fully explained by the changes in substrate binding, suggesting that neither of the mutations affect the catalytic rate. Crystal structures of all four mutants were determined to a resolution of 2.0 A. Except for the partly or completely missing side-chain, no significant changes compared to the wild-type protein structure were found for the mutants at position 331, whereas a small but significant backbone displacement around the mutation site in A334V and A334I may explain the observed thermal destabilization.
__TOC__
 
</StructureSection>
==About this Structure==
[[Category: Large Structures]]
1QA1 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Yersinia_phage_py54 Yersinia phage py54]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QA1 OCA].
[[Category: Salmonella virus P22]]
 
[[Category: Baxa U]]
==Reference==
[[Category: Huber R]]
Mutations improving the folding of phage P22 tailspike protein affect its receptor binding activity., Baxa U, Steinbacher S, Weintraub A, Huber R, Seckler R, J Mol Biol. 1999 Oct 29;293(3):693-701. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/10543960 10543960]
[[Category: Seckler R]]
[[Category: Single protein]]
[[Category: Steinbacher S]]
[[Category: Yersinia phage py54]]
[[Category: Weintraub A]]
[[Category: Baxa, U.]]
[[Category: Huber, R.]]
[[Category: Seckler, R.]]
[[Category: Steinbacher, S.]]
[[Category: Weintraub, A.]]
[[Category: virus/viral protein]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:34:54 2008''

Latest revision as of 12:00, 21 February 2024

TAILSPIKE PROTEIN, MUTANT V331GTAILSPIKE PROTEIN, MUTANT V331G

Structural highlights

1qa1 is a 1 chain structure with sequence from Salmonella virus P22. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 2Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

FIBER_BPP22 Structural component of the short non-contractile tail. The tail comprises six fibers that mediate primary attachment to the host cell lipopolysaccharides (LPS) and display endorhamnosidase enzymatic activity, hydrolyzing the alpha-1,3-O-glycosidic linkage between rhamnose and galactose of the O-antigen polysaccharide. Digestion of the LPS brings the capsid near the cell outer membrane.[1] [2]

See Also

References

  1. ↑ Weigele PR, Scanlon E, King J. Homotrimeric, beta-stranded viral adhesins and tail proteins. J Bacteriol. 2003 Jul;185(14):4022-30. PMID:12837775
  2. ↑ Andres D, Hanke C, Baxa U, Seul A, Barbirz S, Seckler R. Tailspike interactions with lipopolysaccharide effect DNA ejection from phage P22 particles in vitro. J Biol Chem. 2010 Nov 19;285(47):36768-75. doi: 10.1074/jbc.M110.169003. Epub, 2010 Sep 3. PMID:20817910 doi:http://dx.doi.org/10.1074/jbc.M110.169003

1qa1, resolution 2.00Å

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