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-Structure paper
タイトル | Structure and size determination of bacteriophage P2 and P4 procapsids: function of size responsiveness mutations. |
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ジャーナル・号・ページ | J Struct Biol, Vol. 178, Issue 3, Page 215-224, Year 2012 |
掲載日 | 2012年4月9日 |
著者 | Altaira D Dearborn / Pasi Laurinmaki / Preethi Chandramouli / Cynthia M Rodenburg / Sifang Wang / Sarah J Butcher / Terje Dokland / |
PubMed 要旨 | Bacteriophage P4 is dependent on structural proteins supplied by a helper phage, P2, to assemble infectious virions. Bacteriophage P2 normally forms an icosahedral capsid with T=7 symmetry from the ...Bacteriophage P4 is dependent on structural proteins supplied by a helper phage, P2, to assemble infectious virions. Bacteriophage P2 normally forms an icosahedral capsid with T=7 symmetry from the gpN capsid protein, the gpO scaffolding protein and the gpQ portal protein. In the presence of P4, however, the same structural proteins are assembled into a smaller capsid with T=4 symmetry. This size determination is effected by the P4-encoded protein Sid, which forms an external scaffold around the small P4 procapsids. Size responsiveness (sir) mutants in gpN fail to assemble small capsids even in the presence of Sid. We have produced large and small procapsids by co-expression of gpN with gpO and Sid, respectively, and applied cryo-electron microscopy and three-dimensional reconstruction methods to visualize these procapsids. gpN has an HK97-like fold and interacts with Sid in an exposed loop where the sir mutations are clustered. The T=7 lattice of P2 has dextro handedness, unlike the laevo lattices of other phages with this fold observed so far. |
リンク | J Struct Biol / PubMed:22508104 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 8.0 Å |
構造データ | EMDB-5405: EMDB-5406: |
由来 |
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