1
|
Pires AJ, Ribeiro T, Thompson A, Venditto I, Fernandes VO, Bule P, Santos H, Alves VD, Pires V, Ferreira LMA, Fontes CMGA, Najmudin S. Purification and crystallographic studies of a putative carbohydrate-binding module from the Ruminococcus flavefaciens FD-1 endoglucanase Cel5A. Acta Crystallogr F Struct Biol Commun 2015; 71:958-61. [PMID: 26249681 PMCID: PMC4528923 DOI: 10.1107/s2053230x15009784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 05/20/2015] [Indexed: 11/10/2022] Open
Abstract
Ruminant herbivores meet their carbon and energy requirements from a symbiotic relationship with cellulosome-producing anaerobic bacteria that efficiently degrade plant cell-wall polysaccharides. The assembly of carbohydrate-active enzymes (CAZymes) into cellulosomes enhances protein stability and enzyme synergistic interactions. Cellulosomes comprise diverse CAZymes displaying a modular architecture in which a catalytic domain is connected, via linker sequences, to one or more noncatalytic carbohydrate-binding modules (CBMs). CBMs direct the appended catalytic modules to their target substrates, thus facilitating catalysis. The genome of the ruminal cellulolytic bacterium Ruminococcus flavefaciens strain FD-1 contains over 200 modular proteins containing the cellulosomal signature dockerin module. One of these is an endoglucanase Cel5A comprising two family 5 glycoside hydrolase catalytic modules (GH5) flanking an unclassified CBM (termed CBM-Rf2) and a C-terminal dockerin. This novel CBM-Rf2 has been purified and crystallized, and data from cacodylate-derivative crystals were processed to 1.02 and 1.29 Å resolution. The crystals belonged to the orthorhombic space group P212121. The CBM-Rf2 structure was solved by a single-wavelength anomalous dispersion experiment at the As edge.
Collapse
Affiliation(s)
- Ana José Pires
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Teresa Ribeiro
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Andrew Thompson
- Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin, 91192 Gif-sur-Yvette, France
| | - Immacolata Venditto
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Vânia O. Fernandes
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
- NZYTech Genes and Enzymes, Estrada do Paço do Lumiar, Campus do Lumiar, Edifício E, 1649-038 Lisbon, Portugal
| | - Pedro Bule
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Helena Santos
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Victor D. Alves
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Virginia Pires
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Luis M. A. Ferreira
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Carlos M. G. A. Fontes
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| | - Shabir Najmudin
- CIISA, Faculdade de Medicina Veterinari, Universidade de Lisboa, Avenida da Universidade Técnica, 1300-477 Lisbon, Portugal
| |
Collapse
|