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      Isolation of Polygalacturonase-Producing Bacterial Strain from Tomatoes (Lycopersicon esculentum Mill.)

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          Abstract

          Background. Polygalacturonase (EC 3.2.1.15) enzyme aids in microbial spoilage of fruits and vegetables. It is very important to find economical ways to producing the enzyme so as to achieve maximum yield in industries due to its use at different areas of production process. Methods. Isolation of polygalacturonase-producing bacterial strain from tomatoes ( Lycopersicon esculentum Mill.) was studied. Polygalacturonase-producing bacterial strains were isolated and screened from tomatoes stored at normal laboratory temperature (25 ± 2°C). They were identified based on their morphological, biochemical, and molecular characteristics. The enzyme produced was partially purified by the ammonium sulphate precipitation method. Molecular weights and optimum conditions for best enzyme activity were obtained by SDS PAGE technique. Results. Five bacterial isolates resulted after screening. Bacterial strain code B5 showed highest polygalacturonase activity. Optimum conditions for polygalacturonase PEC B5 were maintained at pH 4.5; temperature 35°C; substrate concentration 0.3 mg/ml, and best activity at less than 5 min of heating. The enzyme PEC B5 was found to weigh 65 kDa and 50 kDa for crude and partially purified aliquots, respectively. The result of 16S rRNA gene sequencing revealed bacterial strain code B5 as Enterobacter tabaci NR146667 having 79% similarity with the NCBI GenBank. Conclusion. Microorganisms should be developed for large-scale production of enzymes in developing countries.

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          Microbial pectinolytic enzymes: A review

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            Tissue- and cell-type specific transcriptome profiling of expanding tomato fruit provides insights into metabolic and regulatory specialization and cuticle formation.

            Tomato (Solanum lycopersicum) is the primary model for the study of fleshy fruits, and research in this species has elucidated many aspects of fruit physiology, development, and metabolism. However, most of these studies have involved homogenization of the fruit pericarp, with its many constituent cell types. Here, we describe the coupling of pyrosequencing technology with laser capture microdissection to characterize the transcriptomes of the five principal tissues of the pericarp from tomato fruits (outer and inner epidermal layers, collenchyma, parenchyma, and vascular tissues) at their maximal growth phase. A total of 20,976 high-quality expressed unigenes were identified, of which more than half were ubiquitous in their expression, while others were cell type specific or showed distinct expression patterns in specific tissues. The data provide new insights into the spatial distribution of many classes of regulatory and structural genes, including those involved in energy metabolism, source-sink relationships, secondary metabolite production, cell wall biology, and cuticle biogenesis. Finally, patterns of similar gene expression between tissues led to the characterization of a cuticle on the inner surface of the pericarp, demonstrating the utility of this approach as a platform for biological discovery.
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              Optimization of Cellulase Production from Bacteria Isolated from Soil

              Cellulase-producing bacteria were isolated from soil and identified as Pseudomonas fluorescens, Bacillus subtilIs, E. coli, and Serratia marcescens. Optimization of the fermentation medium for maximum cellulase production was carried out. The culture conditions like pH, temperature, carbon sources, and nitrogen sources were optimized. The optimum conditions found for cellulase production were 40°C at pH 10 with glucose as carbon source and ammonium sulphate as nitrogen source, and coconut cake stimulates the production of cellulase. Among bacteria, Pseudomonas fluorescens is the best cellulase producer among the four followed by Bacillus subtilis, E. coli, and Serratia marscens.
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                Author and article information

                Journal
                International Journal of Microbiology
                International Journal of Microbiology
                Hindawi Limited
                1687-918X
                1687-9198
                January 15 2019
                January 15 2019
                : 2019
                : 1-9
                Affiliations
                [1 ]Department of Biological Sciences, Covenant University, PMB 1023, Ota, Ogun State, Nigeria
                [2 ]Department of Biological Sciences, Augustine University, PMB 1010, Epe, Lagos State, Nigeria
                Article
                10.1155/2019/7505606
                e25d3e3b-9abe-4359-b67e-ca5353a54ea0
                © 2019

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