Assessment of Bioactive Potential and Characterization of an Anticancer Compound from the Endophytic Fungi of Ocimum sanctum

IF 1.3 4区 生物学 Q4 MICROBIOLOGY Microbiology Pub Date : 2024-07-26 DOI:10.1134/s002626172360252x
A. Verma, K. Kumar, U. Talukdar, G. Pal, D. Kumar, P. Shukla, S. Patel, A. Kumar, A. Kumar, R. N. Kharwar, S. K. Verma
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Abstract

The goal of this study was to isolate endophytic fungi from Ocimum sanctum L. and to evaluate their biological potential, including antibacterial, antioxidant, and enzymatic activities and further characterization of the bioactive compounds. Nine endophytic fungi were isolated from the leaves and stem tissues of O. sanctum collected from the botanical garden of Banaras Hindu University, Varanasi, India. All isolates were identified based on their microscopic structures and molecular sequencing of the ITS rDNA. Aspergillus clavatonanicus (SS7) and Cochliobolus hawaiiensis (SL3) showed the highest colonization frequencies in the stem and leaves (16 and 14%, respectively). All fungal isolates were tested for extracellular enzymatic activities of amylase, cellulase, and pectinase. Of the nine fungal isolates, 60% tested positive for amylase and cellulase, whereas 50% showed pectinase activity. Using a disc diffusion assay, the extracted secondary metabolites were checked for antibacterial activity against three human pathogenic bacteria. Two isolates, SL2 and SS7, exhibited the highest antibacterial activity against all pathogens, including Enterococcus faecalis, Klebsiella pneumoniae, and methicillin-resistant Staphylococcus aureus (MRSA). Crude extracts of the six fungal isolates showed positive antioxidant activity. The crude extract of Aspergillus allahabadii (isolate SL2) showed strong antibacterial and antioxidant activities and crystallized during purification. X-ray crystallography confirmed the identity of the crystal as citrinin, which also exhibited strong anticancer activity against Dalton’s lymphoma cells. The results of this study suggest that endophytic fungi isolated from the leaf and stem tissues of Ocimum sanctum are potential sources of antibacterial, antioxidant, and anticancer compounds.

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评估欧琴圣草内生真菌中一种抗癌化合物的生物活性潜力并确定其特性
摘要 本研究的目的是从圣女果(Ocimum sanctum L.)中分离内生真菌,并评估其生物潜力,包括抗菌、抗氧化和酶活性,以及生物活性化合物的进一步表征。研究人员从印度瓦拉纳西巴纳拉斯印度教大学植物园采集的圣女果叶和茎组织中分离出九种内生真菌。根据其显微结构和 ITS rDNA 的分子测序,对所有分离物进行了鉴定。Aspergillus clavatonanicus(SS7)和 Cochliobolus hawaiiensis(SL3)在茎和叶中的定殖频率最高(分别为 16% 和 14%)。对所有真菌分离物进行了淀粉酶、纤维素酶和果胶酶的胞外酶活性测试。在 9 个真菌分离物中,60% 的淀粉酶和纤维素酶检测呈阳性,50% 显示出果胶酶活性。通过盘扩散试验,检测了提取的次生代谢物对三种人类致病菌的抗菌活性。SL2 和 SS7 这两种分离物对所有病原体(包括粪肠球菌、肺炎克雷伯氏菌和耐甲氧西林金黄色葡萄球菌(MRSA))的抗菌活性最高。六种真菌分离物的粗提取物显示出积极的抗氧化活性。Allahabadii 曲霉(分离物 SL2)的粗提物显示出很强的抗菌和抗氧化活性,并在纯化过程中结晶。X 射线晶体学证实该晶体为柠檬苦素,它对道尔顿淋巴瘤细胞也具有很强的抗癌活性。这项研究结果表明,从欧加木圣洁叶和茎组织中分离出的内生真菌是抗菌、抗氧化和抗癌化合物的潜在来源。
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来源期刊
Microbiology
Microbiology 生物-微生物学
CiteScore
2.40
自引率
13.30%
发文量
60
审稿时长
6-12 weeks
期刊介绍: Microbiology is an is an international peer reviewed journal that covers a wide range of problems in the areas of fundamental and applied microbiology. The journal publishes experimental and theoretical papers, reviews on modern trends in different fields of microbiological science, and short communications with descriptions of unusual observations. The journal welcomes manuscripts from all countries in the English or Russian language.
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