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Purification, crystallization and catalytic activity of the ETHE1 and DUF442 domains of the BLH protein from Xylella fastidiosa and Agrobacterium tumefaciens

Grant number: 11/14969-8
Support Opportunities:Scholarships in Brazil - Master
Effective date (Start): March 01, 2012
Effective date (End): February 28, 2014
Field of knowledge:Biological Sciences - Biochemistry - Molecular Biology
Principal Investigator:Celso Eduardo Benedetti
Grantee:Nayara Patricia Vieira de Lira
Host Institution: Centro Nacional de Pesquisa em Energia e Materiais (CNPEM). Ministério da Ciência, Tecnologia e Inovação (Brasil). Campinas , SP, Brazil


Xylella fastidiosa and Agrobacterium tumefaciens are plant pathogenic bacteria with a wide host range. X. fastidiosa colonizes the vascular tissue occluding the xylem vessels, causing the development of diseases such as Citrus Variegated Chlorosis (CVC). A. tumefaciens is a root-associated bacterium that also colonizes the vascular tissues, and it induces a kind of cell hyperplasia known as the Crown Gall disease. We have shown previously that both Xylella and Agrobacterium cells have an operon denominated "bigR" which is required for the detoxification of hydrogen sulfide, a toxic compound that inhibits cytochrome C oxidase, thus blocking aerobic respiration. We found that the bigR operon catalyses the formation and secretion of sulfite from hydrogen sulfide, allowing the cells to grow in oxygen-limited environments. Although much has been learned about the transcriprional regulation of the bigR operon, little is known of the function of BLH (beta-lactamase-like hydrolase), an enzyme thought to convert hydrogen sulfide into sulfite. BLH has two functional domains, DUF442, thought to display a rhodanese activity, and ETHE1, with a sulfur dioxygenase activity. Although a few crystall structures related to the DUF442 and ETHE1 domains have been described, how hydrogen sulfide is converted to sulfite is not known. In addition, how the activity of these two domains is connected remains a mystery. The aim of this project is to express, purify and crystallize the ETHE1 and DUFF442 domains from BLH proteins from X. fastidiosa and A. tumefaciens for structural and biochemical analysis. We expect to find enzymatic activities for the DUFF442 and ETHE1 domains associated with rhodanese and sulfur dioxygenase, respectively.

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Academic Publications
(References retrieved automatically from State of São Paulo Research Institutions)
LIRA, Nayara Patricia Vieira de. Expression, purification and activity assay of the DUF442 and ETHE1 of Blh protein of Xylella fastidiosa and Agrobacterium tumefaciens. 2014. Master's Dissertation - Universidade Estadual de Campinas (UNICAMP). Instituto de Biologia Campinas, SP.

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