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TitleThe tripartite capsid gene of Salmonella phage Gifsy-2 yields a capsid assembly pathway engaging features from HK97 and lambda.
Journal, issue, pagesVirology, Vol. 402, Issue 2, Page 355-365, Year 2010
Publish dateJul 5, 2010
AuthorsGrégory Effantin / Nara Figueroa-Bossi / Guy Schoehn / Lionello Bossi / James F Conway /
PubMed AbstractPhage Gifsy-2, a lambdoid phage infecting Salmonella, has an unusually large composite gene coding for its major capsid protein (mcp) at the C-terminal end, a ClpP-like protease at the N-terminus, ...Phage Gifsy-2, a lambdoid phage infecting Salmonella, has an unusually large composite gene coding for its major capsid protein (mcp) at the C-terminal end, a ClpP-like protease at the N-terminus, and a approximately 200 residue central domain of unknown function but which may have a scaffolding role. This combination of functions on a single coding region is more extensive than those observed in other phages such as HK97 (scaffold-capsid fusion) and lambda (protease-scaffold fusion). To study the structural phenotype of the unique Gifsy-2 capsid gene, we have purified Gifsy-2 particles and visualized capsids and procapsids by cryoelectron microscopy, determining structures to resolutions up to 12A. The capsids have lambdoid T=7 geometry and are well modeled with the atomic structures of HK97 mcp and phage lambda gpD decoration protein. Thus, the unique Gifsy-2 capsid protein gene yields a capsid maturation pathway engaging features from both phages HK97 and lambda.
External linksVirology / PubMed:20427067
MethodsEM (single particle)
Resolution11.8 - 25.6 Å
Structure data

EMDB-1691:
Cryo-EM reconstruction of Phage Gifsy-2 procapsid
Method: EM (single particle) / Resolution: 11.8 Å

EMDB-1692:
Cryo-EM reconstruction of Phage Gifsy-2 darker procapsid
Method: EM (single particle) / Resolution: 25.6 Å

EMDB-1693:
Cryo-EM reconstruction of Phage Gifsy-2 expanded procapsid
Method: EM (single particle) / Resolution: 15.3 Å

EMDB-1694:
Cryo-EM reconstruction of Phage Gifsy-2 mature capsid
Method: EM (single particle) / Resolution: 16.7 Å

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