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Ajji PK, Sonkar SP, Walder K, Puri M. Purification and functional characterization of recombinant balsamin, a ribosome-inactivating protein from Momordica balsamina. Int J Biol Macromol 2018; 114:226-234. [PMID: 29471092 DOI: 10.1016/j.ijbiomac.2018.02.114] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2017] [Revised: 02/10/2018] [Accepted: 02/16/2018] [Indexed: 10/18/2022]
Abstract
Balsamin, a type I ribosome-inactivating protein (RIP), has been shown to inhibit HIV-1 replication at the translation step. Our recent studies have shown that balsamin also possess anti-tumor, antibacterial and DNase-like activity, however, the amount of natural balsamin in Momordica balsamina seeds is limited and preclinical studies require large quantities of pure, bioactive balsamin. Therefore, in this study, we cloned the balsamin gene, expressed it in E.coli BL21 (DE3) strain and purified it by nickel affinity chromatography. Functional analysis indicated that balsamin exhibits both RNA N-glycosidase activity, releasing the Endo-fragment from rabbit reticulocyte rRNA, and DNase-like activity, converting the supercoiled form of a plasmid into the linear form in a concentration-dependent manner. Analysis of secondary structure revealed that recombinant balsamin mainly consisted of α-helical and random coiled with minimal turns and β-sheets. Recombinant balsamin was found to be stable in the temperature range of 20-60 °C and pH range of 6-9. Antimicrobial assays showed that the minimum inhibitory concentrations of recombinant balsamin for various pathogens ranged between 1.56 and 12.5 μg/ml. Heterologous expression and purification of balsamin carries great importance as it provides an alternative approach for large-scale preparation of biologically active recombinant balsamin, which is difficult from its natural source.
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Affiliation(s)
- Parminder K Ajji
- Centre for Chemistry and Biotechnology, School of Life and Environment Sciences, Deakin University, Waurn Ponds, 75 Pigdons Road, Locked Bag 20000, Geelong, VIC 3220, Australia
| | - Shailendra P Sonkar
- Centre for Chemistry and Biotechnology, School of Life and Environment Sciences, Deakin University, Waurn Ponds, 75 Pigdons Road, Locked Bag 20000, Geelong, VIC 3220, Australia
| | - Ken Walder
- Centre for Molecular and Medical Research, School of Medicine, Deakin University, Waurn Ponds, 75 Pigdons Road, Locked Bag 20000, Geelong, VIC 3220, Australia
| | - Munish Puri
- Centre for Chemistry and Biotechnology, School of Life and Environment Sciences, Deakin University, Waurn Ponds, 75 Pigdons Road, Locked Bag 20000, Geelong, VIC 3220, Australia; Centre for Marine Bioproducts Development, College of Medicine and Public Health, Flinders University, Adelaide, Australia.
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Gupta A, Singh D, Byreddy AR, Thyagarajan T, Sonkar SP, Mathur AS, Tuli DK, Barrow CJ, Puri M. Exploring omega-3 fatty acids, enzymes and biodiesel producing thraustochytrids from Australian and Indian marine biodiversity. Biotechnol J 2015; 11:345-55. [PMID: 26580151 DOI: 10.1002/biot.201500279] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 07/09/2015] [Accepted: 10/14/2015] [Indexed: 11/06/2022]
Abstract
The marine environment harbours a vast diversity of microorganisms, many of which are unique, and have potential to produce commercially useful materials. Therefore, marine biodiversity from Australian and Indian habitat has been explored to produce novel bioactives, and enzymes. Among these, thraustochytrids collected from Indian habitats were shown to be rich in saturated fatty acids (SFAs) and monounsaturated fatty acids (MUFAs), together constituting 51-76% of total fatty acids (TFA). Indian and Australian thraustochytrids occupy separate positions in the dendrogram, showing significant differences exist in the fatty acid profiles in these two sets of thraustochytrid strains. In general, Australian strains had a higher docosahexaenoic acid (DHA) content than Indian strains with DHA at 17-31% of TFA. A range of enzyme activities were observed in the strains, with Australian strains showing overall higher levels of enzyme activity, with the exception of one Indian strain (DBTIOC-1). Comparative analysis of the fatty acid profile of 34 strains revealed that Indian thraustochytrids are more suitable for biodiesel production since these strains have higher fatty acids content for biodiesel (FAB, 76%) production than Australian thraustochytrids, while the Australian strains are more suitable for omega-3 (40%) production.
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Affiliation(s)
- Adarsha Gupta
- Centre for Chemistry and Biotechnology, (CCB), School of Life and Environment Sciences, Deakin University, Geelong, Victoria, Australia
| | - Dilip Singh
- Centre for Chemistry and Biotechnology, (CCB), School of Life and Environment Sciences, Deakin University, Geelong, Victoria, Australia.,DBT-IOC Centre for Advance Bioenergy Research, Research & Development Centre, IndianߚOil Corporation Limited, Faridabad, India
| | - Avinesh R Byreddy
- Centre for Chemistry and Biotechnology, (CCB), School of Life and Environment Sciences, Deakin University, Geelong, Victoria, Australia
| | - Tamilselvi Thyagarajan
- Centre for Chemistry and Biotechnology, (CCB), School of Life and Environment Sciences, Deakin University, Geelong, Victoria, Australia
| | - Shailendra P Sonkar
- Centre for Chemistry and Biotechnology, (CCB), School of Life and Environment Sciences, Deakin University, Geelong, Victoria, Australia
| | - Anshu S Mathur
- DBT-IOC Centre for Advance Bioenergy Research, Research & Development Centre, IndianߚOil Corporation Limited, Faridabad, India
| | - Deepak K Tuli
- DBT-IOC Centre for Advance Bioenergy Research, Research & Development Centre, IndianߚOil Corporation Limited, Faridabad, India
| | - Colin J Barrow
- Centre for Chemistry and Biotechnology, (CCB), School of Life and Environment Sciences, Deakin University, Geelong, Victoria, Australia.
| | - Munish Puri
- Centre for Chemistry and Biotechnology, (CCB), School of Life and Environment Sciences, Deakin University, Geelong, Victoria, Australia.
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Naesby M, Nielsen SV, Nielsen CA, Green T, Tange TO, Simón E, Knechtle P, Hansson A, Schwab MS, Titiz O, Folly C, Archila RE, Maver M, van Sint Fiet S, Boussemghoune T, Janes M, Kumar ASS, Sonkar SP, Mitra PP, Benjamin VAK, Korrapati N, Suman I, Hansen EH, Thybo T, Goldsmith N, Sorensen AS. Yeast artificial chromosomes employed for random assembly of biosynthetic pathways and production of diverse compounds in Saccharomyces cerevisiae. Microb Cell Fact 2009; 8:45. [PMID: 19678954 PMCID: PMC2732597 DOI: 10.1186/1475-2859-8-45] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2009] [Accepted: 08/13/2009] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Natural products are an important source of drugs and other commercially interesting compounds, however their isolation and production is often difficult. Metabolic engineering, mainly in bacteria and yeast, has sought to circumvent some of the associated problems but also this approach is impeded by technical limitations. Here we describe a novel strategy for production of diverse natural products, comprising the expression of an unprecedented large number of biosynthetic genes in a heterologous host. RESULTS As an example, genes from different sources, representing enzymes of a seven step flavonoid pathway, were individually cloned into yeast expression cassettes, which were then randomly combined on Yeast Artificial Chromosomes and used, in a single transformation of yeast, to create a variety of flavonoid producing pathways. Randomly picked clones were analysed, and approximately half of them showed production of the flavanone naringenin, and a third of them produced the flavonol kaempferol in various amounts. This reflected the assembly of 5-7 step multi-species pathways converting the yeast metabolites phenylalanine and/or tyrosine into flavonoids, normally only produced by plants. Other flavonoids were also produced that were either direct intermediates or derivatives thereof. Feeding natural and unnatural, halogenated precursors to these recombinant clones demonstrated the potential to further diversify the type of molecules that can be produced with this technology. CONCLUSION The technology has many potential uses but is particularly suited for generating high numbers of structurally diverse compounds, some of which may not be amenable to chemical synthesis, thus greatly facilitating access to a huge chemical space in the search for new commercially interesting compounds.
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Affiliation(s)
- Michael Naesby
- Evolva A/S, Bülowsvej 25, 1870 Frederiksberg C, Denmark.
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