The ethyl acetate extract of the marine bacterial strain Streptomyces rochei sp. 81 was purified by silica gel column chromatography to obtain three diketopiperazines (1–3) and one straight chain fatty acid (4). The compounds were identified as cyclo(L-leu-N-ethenethiol-L-pro) (1), cyclo(L-Leu-L-Pro) (2), cyclo(L-Pro-D-Tyr) (3), and 2,4-dimethyldocasonoic acid (4) by HR-ESI-MS and NMR techniques. One new (1) and three known compounds (2–4) were screened for carbonic anhydrase-II (CA-II) inhibition and as a result 1 and 3 were found to be the most active compounds with IC50 of 9.8 ± 0.56 and 10.9 ± 0.88 μM, respectively. The results indicated that these two compounds (1 and 3) can be promising candidates for anticancer drugs.
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Acknowledgment
The project was supported by the funded project (BFP/RGP/CBS/18/011) awarded by The Oman Research Council (TRC). The study was also funded by the Gulf Cooperation Council (GCC) collaborative work between Kuwait University, Kuwait, Sultan Qaboos University, Oman and University of Nizwa, Oman.
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Published in Khimiya Prirodnykh Soedinenii, No. 2, March–April, 2023, pp. 292–295.
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Al-Rawahi, A.N., Abed, R.M.M., Rehman, N.U. et al. New Sulfur-Containing Diketopiperazine from Marine-Derived Bacteria Streptomyces rochei sp. 81 with Potent Carbonic Anhydrase II Inhibition. Chem Nat Compd 59, 346–350 (2023). https://doi.org/10.1007/s10600-023-03990-0
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DOI: https://doi.org/10.1007/s10600-023-03990-0