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Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone

Bacteriophage T5, a Siphovirus belonging to the order Caudovirales, has a flexible, three-fold symmetric tail, to which three L-shaped fibres are attached. These fibres recognize oligo-mannose units on the bacterial cell surface prior to infection and are composed of homotrimers of the pb1 protein....

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Autores principales: Garcia-Doval, Carmela, Castón, José R., Luque, Daniel, Granell, Meritxell, Otero, José M., Llamas-Saiz, Antonio L., Renouard, Madalena, Boulanger, Pascale, van Raaij, Mark J.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4690869/
https://www.ncbi.nlm.nih.gov/pubmed/26670244
http://dx.doi.org/10.3390/v7122946
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author Garcia-Doval, Carmela
Castón, José R.
Luque, Daniel
Granell, Meritxell
Otero, José M.
Llamas-Saiz, Antonio L.
Renouard, Madalena
Boulanger, Pascale
van Raaij, Mark J.
author_facet Garcia-Doval, Carmela
Castón, José R.
Luque, Daniel
Granell, Meritxell
Otero, José M.
Llamas-Saiz, Antonio L.
Renouard, Madalena
Boulanger, Pascale
van Raaij, Mark J.
author_sort Garcia-Doval, Carmela
collection PubMed
description Bacteriophage T5, a Siphovirus belonging to the order Caudovirales, has a flexible, three-fold symmetric tail, to which three L-shaped fibres are attached. These fibres recognize oligo-mannose units on the bacterial cell surface prior to infection and are composed of homotrimers of the pb1 protein. Pb1 has 1396 amino acids, of which the carboxy-terminal 133 residues form a trimeric intra-molecular chaperone that is auto-proteolyzed after correct folding. The structure of a trimer of residues 970–1263 was determined by single anomalous dispersion phasing using incorporated selenomethionine residues and refined at 2.3 Å resolution using crystals grown from native, methionine-containing, protein. The protein inhibits phage infection by competition. The phage-distal receptor-binding domain resembles a bullet, with the walls formed by partially intertwined beta-sheets, conferring stability to the structure. The fold of the domain is novel and the topology unique to the pb1 structure. A site-directed mutant (Ser1264 to Ala), in which auto-proteolysis is impeded, was also produced, crystallized and its 2.5 Å structure solved by molecular replacement. The additional chaperone domain (residues 1263–1396) consists of a central trimeric alpha-helical coiled-coil flanked by a mixed alpha-beta domain. Three long beta-hairpin tentacles, one from each chaperone monomer, extend into long curved grooves of the bullet-shaped domain. The chaperone-containing mutant did not inhibit infection by competition.
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spelling pubmed-46908692016-01-04 Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone Garcia-Doval, Carmela Castón, José R. Luque, Daniel Granell, Meritxell Otero, José M. Llamas-Saiz, Antonio L. Renouard, Madalena Boulanger, Pascale van Raaij, Mark J. Viruses Article Bacteriophage T5, a Siphovirus belonging to the order Caudovirales, has a flexible, three-fold symmetric tail, to which three L-shaped fibres are attached. These fibres recognize oligo-mannose units on the bacterial cell surface prior to infection and are composed of homotrimers of the pb1 protein. Pb1 has 1396 amino acids, of which the carboxy-terminal 133 residues form a trimeric intra-molecular chaperone that is auto-proteolyzed after correct folding. The structure of a trimer of residues 970–1263 was determined by single anomalous dispersion phasing using incorporated selenomethionine residues and refined at 2.3 Å resolution using crystals grown from native, methionine-containing, protein. The protein inhibits phage infection by competition. The phage-distal receptor-binding domain resembles a bullet, with the walls formed by partially intertwined beta-sheets, conferring stability to the structure. The fold of the domain is novel and the topology unique to the pb1 structure. A site-directed mutant (Ser1264 to Ala), in which auto-proteolysis is impeded, was also produced, crystallized and its 2.5 Å structure solved by molecular replacement. The additional chaperone domain (residues 1263–1396) consists of a central trimeric alpha-helical coiled-coil flanked by a mixed alpha-beta domain. Three long beta-hairpin tentacles, one from each chaperone monomer, extend into long curved grooves of the bullet-shaped domain. The chaperone-containing mutant did not inhibit infection by competition. MDPI 2015-12-08 /pmc/articles/PMC4690869/ /pubmed/26670244 http://dx.doi.org/10.3390/v7122946 Text en © 2015 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Garcia-Doval, Carmela
Castón, José R.
Luque, Daniel
Granell, Meritxell
Otero, José M.
Llamas-Saiz, Antonio L.
Renouard, Madalena
Boulanger, Pascale
van Raaij, Mark J.
Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone
title Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone
title_full Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone
title_fullStr Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone
title_full_unstemmed Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone
title_short Structure of the Receptor-Binding Carboxy-Terminal Domain of the Bacteriophage T5 L-Shaped Tail Fibre with and without Its Intra-Molecular Chaperone
title_sort structure of the receptor-binding carboxy-terminal domain of the bacteriophage t5 l-shaped tail fibre with and without its intra-molecular chaperone
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4690869/
https://www.ncbi.nlm.nih.gov/pubmed/26670244
http://dx.doi.org/10.3390/v7122946
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