2ft1

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[[Image:2ft1.gif|left|200px]]
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{{Seed}}
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[[Image:2ft1.png|left|200px]]
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{{STRUCTURE_2ft1| PDB=2ft1 | SCENE= }}
{{STRUCTURE_2ft1| PDB=2ft1 | SCENE= }}
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'''Bacteriophage HK97 Head II'''
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===Bacteriophage HK97 Head II===
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==Overview==
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Maturation of the bacteriophage HK97 capsid from a precursor (Prohead II) to the mature state (Head II) involves a 60 A radial expansion. The mature particle is formed by 420 copies of the major capsid protein organized on a T = 7 laevo lattice with each subunit covalently crosslinked to two neighbors. Well-characterized pH 4 expansion intermediates make HK97 valuable for investigating quaternary structural dynamics. Here, we use X-ray crystallography and cryo-EM to demonstrate that in the final transition in maturation (requiring neutral pH), pentons in Expansion Intermediate IV (EI-IV) reversibly sample 14 A translations and 6 degrees rotations relative to a fixed hexon lattice. The limit of this trajectory corresponds to the Head II conformation that is secured at this extent only by the formation of the final class of covalent crosslinks. Mutants that cannot crosslink or EI-IV particles that have been rendered incapable of forming the final crosslink remain in the EI-IV state.
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(as it appears on PubMed at http://www.pubmed.gov), where 17098191 is the PubMed ID number.
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{{ABSTRACT_PUBMED_17098191}}
==About this Structure==
==About this Structure==
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[[Category: Hk97]]
[[Category: Hk97]]
[[Category: Mature capsid]]
[[Category: Mature capsid]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 04:16:59 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 15:30:52 2008''

Revision as of 12:31, 29 July 2008

Image:2ft1.png

Template:STRUCTURE 2ft1

Bacteriophage HK97 Head II

Template:ABSTRACT PUBMED 17098191

About this Structure

2FT1 is a Single protein structure of sequence from Enterobacteria phage hk97. Full crystallographic information is available from OCA.

Reference

Capsid conformational sampling in HK97 maturation visualized by X-ray crystallography and cryo-EM., Gan L, Speir JA, Conway JF, Lander G, Cheng N, Firek BA, Hendrix RW, Duda RL, Liljas L, Johnson JE, Structure. 2006 Nov;14(11):1655-65. PMID:17098191

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