Abstract
A cyanobacterial strain (Anabaena laxa RPAN8) exhibiting fungicidal activity and β-1,3 and 1,4 endoglucanase activities was selected for identifying the gene(s) involved. Functional analyses of the genomic library revealed that four clones (8, 64, 116, and 248) of RPAN8 exhibited fungicidal activity and induced structural deformities in the cell wall of the growing mycelia of Pythium aphanidermatum. Higher expression of fungicidal and β-1,4 endoglucanase activities, along with low expression of β-1,3 endoglucanase activity, was recorded in two E. coli clones (8 and 64). Clones 8 and 64 exhibited identical sequences while clones 116 and 248 were also similar. Bioinformatic analyses were undertaken only for the two non-identical clones 8 and 116 which showed open reading frames (ORFs) of 348 (end 1) and 656 amino acid residues (end 2), respectively. The amino acid sequence analyses revealed that the end 1 encoding endoglucanases belonged to peptidase M20 family while end 2 showed significant similarities with several known genes. The putative promoters and ribosomal binding sites were identified and amino acid exchanges were observed in both end 1 and 2. The presence of signal peptides of 24 and 20 amino acid residues respectively revealed the secretory nature of these proteins.
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Acknowledgments
The study was funded by the AMAAS Network Project on Microorganisms, (Theme: Microbial Genomics) supported by the Indian Council of Agricultural Research, New Delhi. We are extremely grateful to Dr. N.K. Singh, National Research Centre for Plant Biotechnology, IARI, New Delhi for providing the facilities for nebulization of genomic DNA. We are thankful to the Division of Microbiology, IARI, New Delhi for providing the necessary facilities for undertaking this study.
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Fig. S1
β-1,3 and 1,4 endoglucanase activities of 28-day-old cultures of RPAN8. The ERROR bars indicate the standard deviation (SD). The differences in the means of the three replicates were found to be statistically significant at a P value of <0.01 by using a one-way ANOVA test. (PDF 15 kb)
Fig. S2
Identification of signal peptide and cleavage site in and deduced amino acids sequences for end 1 (a); Anabaena/Nostoc glucanases (b); end 2 (c) and Nostoc endoglucanase (d) by HMM (Hidden Markov Model) algorithm. (PDF 37 kb)
Fig. S3
Multiple sequence alignment of marine cyanobacterial strong promoter (for enhanced gene expression of foreign gene) with end 2 promoter sequence. (PDF 18 kb)
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Gupta, V., Natarajan, C., Kumar, K. et al. Identification and characterization of endoglucanases for fungicidal activity in Anabaena laxa (Cyanobacteria). J Appl Phycol 23, 73–81 (2011). https://doi.org/10.1007/s10811-010-9539-1
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DOI: https://doi.org/10.1007/s10811-010-9539-1