Document Detail

Gluconacetobacter diazotrophicus levansucrase is involved in tolerance to NaCl, sucrose and desiccation, and in biofilm formation.
MedLine Citation:
PMID:  21103984     Owner:  NLM     Status:  In-Process    
Gluconacetobacter diazotrophicus is a nitrogen-fixing bacterium and endophyte of sugarcane, which expresses levansucrase, a fructosyltransferase exoenzyme with sucrose hydrolytic and levan biosynthetic activities. As a result of their physical properties, the levan can provide protection against stress caused by abiotic or biotic factors and participate in the formation of biofilms. In this study, we investigated the construction and function of a levansucrase-defective mutant of G. diazotrophicus. The lsdA mutant showed a decreased tolerance (65.5%) to 50-150 mM NaCl and a decrease of 89% in 876 mM (30%) sucrose, a reduction (99%) in tolerance to desiccation after 18 h, and a decrease (36.9-58.5%) in the ability to form cell aggregates on abiotic surfaces. Complementation of the mutant with the complete lsdA gene leads to a recovery of the ability to grow on sucrose-containing medium and to form slimy colonies, the ability to form the cell aggregates on abiotic surfaces and the tolerance to NaCl. This report demonstrates the importance of levansucrase in environmental adaptation of G. diazotrophicus under high osmotic stress and in biofilm formation.
M Lourdes Velázquez-Hernández; Víctor M Baizabal-Aguirre; Fermín Cruz-Vázquez; Mayra J Trejo-Contreras; Luis E Fuentes-Ramírez; Alejandro Bravo-Patiño; Marcos Cajero-Juárez; Martha P Chávez-Moctezuma; Juan J Valdez-Alarcón
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-11-20
Journal Detail:
Title:  Archives of microbiology     Volume:  193     ISSN:  1432-072X     ISO Abbreviation:  Arch. Microbiol.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0410427     Medline TA:  Arch Microbiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  137-49     Citation Subset:  IM    
Centro Multidisciplinario de Estudios en Biotecnología, Facultad de Medicina Veterinaria y Zootecnia, Universidad Michoacana de San Nicolás de Hidalgo, Michoacán, México.
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