Abstract |
The melanin pigment produced from Streptomyces sp., MVCS6 was isolated and dihydroxyphenyalanine ( DOPA) melanin compound was biochemically identified and spectroscopically characterised (ultraviolet and FT-IR). DOPA melanin showed a promising activity as an antibacterial natural product against 12 pathogenic bacteria from hospital isolations, particularly, against Pseudomonas aeruginosa RMMH7 (inhibition zone of 18 ± 0.02 at 30 μg/disc, and MIC of 10 ± 0.02 μg/mL) and Vibrio parahaemolytics RMMH12 (inhibition zone of 15 mm ± 0.03 at 30 μg/disc, and MIC of 14 ± 0.02 μg/mL). Moreover, in vitro evaluation of reducing power ( Ascorbic Acid Equivalent (160 μg/mL)), DPPH radical-scavenging (89%), NO-scavenging (72%) and lipid peroxidation activities (89.6%) were determined. Cytotoxicity of DOPA melanin against cervical cancer cell line showed a dose-response activity, and IC50 value was found to be 300 μg/mL. These results would open the way to propose Streptomyces sp. MVCS6 as a promising source of bioactive eumelanin with therapeutic potential in medicine.
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Authors | P Sivaperumal, K Kamala, R Rajaram |
Journal | Natural product research
(Nat Prod Res)
Vol. 29
Issue 22
Pg. 2117-21
( 2015)
ISSN: 1478-6427 [Electronic] England |
PMID | 25518869
(Publication Type: Journal Article)
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Chemical References |
- Anti-Bacterial Agents
- Antioxidants
- Dihydroxyphenylalanine
- DOPA melanin
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Topics |
- Anti-Bacterial Agents
(chemistry, isolation & purification)
- Antioxidants
(chemistry, isolation & purification)
- Cell Line, Tumor
(drug effects)
- Dihydroxyphenylalanine
(analogs & derivatives, chemistry, isolation & purification)
- Humans
- India
- Microbial Sensitivity Tests
- Pseudomonas aeruginosa
(drug effects)
- Seawater
(microbiology)
- Streptomyces
(chemistry)
- Vibrio parahaemolyticus
(drug effects)
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