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        Extracellular Novel Metalloprotease from Xenorhabdus indica and Its Potential as an Insecticidal Agent

        ( Kumar Pranaw ),( Surender Singh ),( Debjani Dutta ),( Nirpendra Singh ),( Garima Sharma ),( Sudershan Ganguly ),( Vinay Kalia ),( Lata Nain ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.11

        Proteases produced by Xenorhabdus are known to play a significant role in virulence leading to insect mortality. The present study was undertaken to purify and characterize protease from Xenorhabdus indica, an endosymbiont of nematode Steinernema thermophilum, and to decipher its role in insect mortality and its efficacy to control Helicoverpa armigera. A set of 10 strains of Xenorhabdus isolated from different regions of India were screened for protease activity on the basis of zone of clearing on gelatin agar plates. One potent strain of Xenorhabdus indica was selected for the production of protease, and the highest production (1,552 U/ml) was observed at 15-18 h of incubation at 28oC in soya casein digest broth. The extracellular protease was purified from culture supernatant using ammonium sulfate precipitation and ion-exchange chromatography. The enzyme was further characterized by SDS-PAGE and zymography, which confirmed the purity of the protein and its molecular mass was found to be ~52 kDa. Further MALDI-TOF/TOF analysis and effect of metal chelating agent 1,10-phenanthrolin study revealed the nature of the purified protease as a secreted alkaline metalloprotease. The bioefficacy of the purified protease was also tested against cotton bollworm (Helicoverpa armigera) and resulted in 67.9 ± 0.64% mortality within one week. This purified protease has the potential to be developed as a natural insecticidal agent against a broad range of agriculturally important insects.

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        Characterization and Antioxidant Potential of a Carotenoid from a Newly Isolated Yeast

        Nirlipta Saha,Amit Kumar Samanta,Surabhi Chaudhuri,Debjani Dutta 한국식품과학회 2015 Food Science and Biotechnology Vol.24 No.1

        A newly isolated yeast strain was identified and explored for characteristic growth and pigment production in batch cultures. Based on nucleotide homology and phylogenetic analysis, the strain was identified as Sporidiobolus pararoseus DAGIII (Accession ID-KF724150). Pigment production was carried out using 1% (v/v) of an inoculum at 25ºC and 120 rpm after incubation for 5 days. By HPLC, Elemental, and FTIR analysis, the produced pigment was identified as β-carotene. The antiradical activity was measured and the half maximal inhibitory concentration (IC50) value was 449.11 μg/mL. Optimization of β-carotene production was achieved using a Plackett-Burman design and response surface methodology. A maximum concentration of 15.2614 mg/L of β-carotene was obtained for cultures in a medium containing 21.77 gm/L of dextrose, 20 gm/L of peptone, and 10 gm/L of yeast extract with incubation at 26ºC, an initial pH of 5.3, a shaker speed of 120 rpm, and a percentage inoculum=1.5%.

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