Structure of the phage TP901-1 1.8 MDa baseplate suggests an alternative host adhesion mechanism.

Abstract:

:Phages of the Caudovirales order possess a tail that recognizes the host and ensures genome delivery upon infection. The X-ray structure of the approximately 1.8 MDa host adsorption device (baseplate) from the lactococcal phage TP901-1 shows that the receptor-binding proteins are pointing in the direction of the host, suggesting that this organelle is in a conformation ready for host adhesion. This result is in marked contrast with the lactococcal phage p2 situation, whose baseplate is known to undergo huge conformational changes in the presence of Ca(2+) to reach its active state. In vivo infection experiments confirmed these structural observations by demonstrating that Ca(2+) ions are required for host adhesion among p2-like phages (936-species) but have no influence on TP901-1-like phages (P335-species). These data suggest that these two families rely on diverse adhesion strategies which may lead to different signaling for genome release.

authors

Veesler D,Spinelli S,Mahony J,Lichière J,Blangy S,Bricogne G,Legrand P,Ortiz-Lombardia M,Campanacci V,van Sinderen D,Cambillau C

doi

10.1073/pnas.1200966109

subject

Has Abstract

pub_date

2012-06-05 00:00:00

pages

8954-8

issue

23

eissn

0027-8424

issn

1091-6490

pii

1200966109

journal_volume

109

pub_type

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