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Plant Transglutaminases: Cloning And Characterization Of The Rice Transglutaminase TGO | 17208
ISSN: 2155-952X

Journal of Biotechnology & Biomaterials
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Plant transglutaminases: Cloning and characterization of the rice transglutaminase TGO

5th World Congress on Biotechnology

Mireya Santos, Nefertiti Campos, Sonia Casta??n, Iratxe Urreta and Josep M Torn?

Posters: J Biotechnol Biomater

DOI: 10.4172/2155-952X.S1.028

Transglutaminases (TGases, EC catalyze post-translational modification of proteins by establishing ε-(γ-glutamyl) links and producing high molecular weight conjugates. Their interest is focussed on clinical applications (neurodegenerative diseases, blood coagulation, etc.), food additives (texturing agents), wool textiles and biopolymers. Plant TGases are poorly characterized and only the maize plastidialTGase gene ( tgz ) related to photosynthesis processes had been cloned. As part of a project to characterize new TGases in plants, here the identification, cloning and characterization of rice ( Oryza sativa ) TGase gene is presented. From the two maize tgzcDNA clonesencoding maize chloroplast TGases ( tgz ) and using differential primers designed from the rice tgz homologous DNA sequence, a 1767 bpcDNA was obtained. A homologous DNA fragment in chromosome 4 of the rice karyotype was localized. The deduced protein sequence contained the TGase catalytic triad (Cys- His-Asp), three repeats, some myristoylation domains, and a leucine zipper motif. Confocal and MET immunolocalization indicated that the protein is not only in the grana chloroplasts but, as a differential characteristic, in protein vesicles near the chloroplasts and in the bulliform cells wall. The E.coli over-expressed TGO protein showed specific activity regulation characteristics, such as calcium and light dependence, plant substrate preference and cross-linking activity. In rice leaves, tgo mRNA expression, TGase activity and immunoblot analyses indicated that TGO expression was light dependent and regulated by the illumination period. Using proteomic and transcriptomic approaches, the related TGO chloroplastic proteins are analyzed. Results are discussed with respect to rice TGase functionality, and possible applications.
Mireya Santos is actually a collaborator researcher at the Dpt. of Chemical and Biomolecular Nanotechnology of the Institute of Applied Chemistry of Catalonia (Barcelona, Spain). She got his PhD in Biology at the Universit of Barcelona in 1985. Until 2013, she was working as a researcher at the Plant Molecular Genetics Department of the Center of Research on Agricultural Genetics, CRAG (CSIC-IRTA-UAB-UB), working on genetics and proteomics of the enzyme Transglutaminase (TGase) on plants, the first TGase cloned in plants, including heterologous protein expression. He has guided many Masters and PhD Thesis, formed part of numerous committees and national and international research groups, always working on molecular and cellular plant biology