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1al0

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Revision as of 07:27, 21 August 2019

PROCAPSID OF BACTERIOPHAGE PHIX174

Structural highlights

1al0 is a 7 chain structure with sequence from Enterobacteria phage phix174. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[B_BPPHX] Participates in the assembly of the viral procapsid in the cytoplasm. Forms first a 12S pre-assembly complex with protein H, and F and G pentamers, then twelve 12S complexes are joined by the D protein to form the procapsid. Internal scaffold protein B is released from the procapsid upon genome packaging, possibly through affinity displacement by the protein J, or by proteolysis. [D_BPPHX] Assembles the procapsid by joining twelve 12S pre-assembly complex into a T=1 icosahedral particle, called 108S procapsid. Ten proteins D bind each 12S complex, which are formed by three pentamers of F, G, B protein and a H protein. The scaffolding protein is released from the provirion after genome packaging to form the mature virion.^[1] ^[2] [G_BPPHX] Attaches the circulating virion to the bacterial lipopolysaccharides which serve as receptor for the virus. Determines the phage host-range. Probably triggers with protein H the injection of the phage DNA into the host cytoplasm upon conformational changes induced by the interaction with host lipopolysaccharides.^[3] ^[4] [F_BPPHX] Assembles to form an icosahedral capsid with a T=1 symmetry, about 30 nm in diameter, and consisting of 60 capsid proteins F.^[5]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

The assembly of a macromolecular structure proceeds along an ordered morphogenetic pathway, and is accomplished by the switching of proteins between discrete conformations as they are added to the nascent assembly. Scaffolding proteins often play a catalytic role in the assembly process, rather like molecular chaperones. Although macromolecular assembly processes are fundamental to all biological systems, they have been characterized most thoroughly in viral systems, such as the icosahedral Escherichia coli bacteriophage phiX174. The phiX174 virion contains the proteins F, G, H and J. During assembly, two scaffoldingproteins B and D are required for the formation of a 108S, 360-A-diameter procapsid from pentameric precursors containing the F, G and H proteins. The procapsid contains 240 copies of protein D, forming an external scaffold, and 60 copies each of the internal scaffolding protein B, the capsid protein F, and the spike protein G. Maturation involves packaging of DNA and J proteins and loss of protein B, producing a 132S intermediate. Subsequent removal of the external scaffold yields the mature virion. Both the F and G proteins have the eight-stranded antiparallel beta-sandwich motif common to many plant and animal viruses. Here we describe the structure of a procapsid-like particle at 3.5-A resolution, showing how the scaffolding proteins coordinate assembly of the virus by interactions with the F and G proteins, and showing that the F protein undergoes conformational changes during capsid maturation.

Structure of a viral procapsid with molecular scaffolding.,Dokland T, McKenna R, Ilag LL, Bowman BR, Incardona NL, Fane BA, Rossmann MG Nature. 1997 Sep 18;389(6648):308-13. PMID:9305849^[6]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Mukai R, Hamatake RK, Hayashi M. Isolation and identification of bacteriophage phi X174 prohead. Proc Natl Acad Sci U S A. 1979 Oct;76(10):4877-81. PMID:159449
↑ Uchiyama A, Fane BA. Identification of an interacting coat-external scaffolding protein domain required for both the initiation of phiX174 procapsid morphogenesis and the completion of DNA packaging. J Virol. 2005 Jun;79(11):6751-6. PMID:15890913 doi:http://dx.doi.org/10.1128/JVI.79.11.6751-6756.2005
↑ Inagaki M, Tanaka A, Suzuki R, Wakashima H, Kawaura T, Karita S, Nishikawa S, Kashimura N. Characterization of the binding of spike H protein of bacteriophage phiX174 with receptor lipopolysaccharides. J Biochem. 2000 Apr;127(4):577-83. PMID:10739948
↑ Inagaki M, Kawaura T, Wakashima H, Kato M, Nishikawa S, Kashimura N. Different contributions of the outer and inner R-core residues of lipopolysaccharide to the recognition by spike H and G proteins of bacteriophage phiX174. FEMS Microbiol Lett. 2003 Sep 26;226(2):221-7. PMID:14553915
↑ Hafenstein S, Fane BA. phi X174 genome-capsid interactions influence the biophysical properties of the virion: evidence for a scaffolding-like function for the genome during the final stages of morphogenesis. J Virol. 2002 Jun;76(11):5350-6. PMID:11991963
↑ Dokland T, McKenna R, Ilag LL, Bowman BR, Incardona NL, Fane BA, Rossmann MG. Structure of a viral procapsid with molecular scaffolding. Nature. 1997 Sep 18;389(6648):308-13. PMID:9305849 doi:10.1038/38537

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1al0"

@@ Line 1: / Line 1: @@
 ==PROCAPSID OF BACTERIOPHAGE PHIX174==
-<StructureSection load='1al0' size='340' side='right' caption='[[1al0]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
+<StructureSection load='1al0' size='340' side='right'caption='[[1al0]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1al0]] is a 7 chain structure with sequence from [http://en.wikipedia.org/wiki/Enterobacteria_phage_phix174 Enterobacteria phage phix174]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AL0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AL0 FirstGlance]. <br>
@@ Line 12: / Line 12: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/al/1al0_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/al/1al0_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 32: / Line 32: @@
 </StructureSection>
 [[Category: Enterobacteria phage phix174]]
+[[Category: Large Structures]]
 [[Category: Dokland, T]]
 [[Category: Rossmann, M G]]

1al0

From Proteopedia

Revision as of 07:27, 21 August 2019

PROCAPSID OF BACTERIOPHAGE PHIX174

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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