Topopyrone B
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| Category | Enzyme inhibitors |
| Catalog number | BBF-02701 |
| CAS | |
| Molecular Weight | 372.71 |
| Molecular Formula | C18H9ClO7 |
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Description
It is produced by the strain of Phoma sp. BAUA 2861 and Penicillum sp. BAUA 4206. Topopyrone B selectively inhibits topoisomerase I with the IC50 of 0.15 ng/mL. It also has anti-Gram-positive bacteria activity and it has a strong inhibitory effect on herpes virus, especially varicella zoster virus (VZV).
Specification
| IUPAC Name | 8-chloro-5,7,9-trihydroxy-2-methylnaphtho[3,2-g]chromene-4,6,11-trione |
| Canonical SMILES | CC1=CC(=O)C2=C(O1)C=C3C(=C2O)C(=O)C4=C(C(=C(C=C4C3=O)O)Cl)O |
| InChI | InChI=1S/C18H9ClO7/c1-5-2-8(20)13-10(26-5)4-7-11(17(13)24)16(23)12-6(15(7)22)3-9(21)14(19)18(12)25/h2-4,21,24-25H,1H3 |
| InChI Key | XQMOGUIQWMFPBF-UHFFFAOYSA-N |
Properties
| Appearance | White Powder |
| Antibiotic Activity Spectrum | Gram-positive bacteria; viruses |
| Melting Point | >280°C |
Reference Reading
1. Novel human topoisomerase I inhibitors, topopyrones A, B, C and D. II. Structure elucidation
D Ishiyama, Y Kanai, H Senda, W Iwatani, W Iwatani, H Konno, S Kanazawa J Antibiot (Tokyo). 2000 Sep;53(9):873-8. doi: 10.7164/antibiotics.53.873.
The structures of novel topoisomerase I inhibitors, topopyrones A, B, C and D were elucidated by spectral analysis of the chemical derivatives. These compounds are an anthraquinone type containing a fused 1,4-pyrone moiety. Topopyrones A and B contain a chlorine atom, however C and D do not. It was suggested that topopyrones B and D are converted from topopyrones A and C, respectively by Wessely-Moser type rearrangement.
2. Total synthesis of topopyrones B and D
Jason Samuel Tan, Marco A Ciufolini Org Lett. 2006 Oct 12;8(21):4771-4. doi: 10.1021/ol0617291.
[reaction: see text] We describe a straightforward synthesis of topopyrones B and D, which are potent and selective inhibitors of topoisomerase I. The chemistry should be suitable for additional structure-activity relationship (SAR) work.
3. Identification and Heterologous Expression of the Topopyrone Nonaketide Synthase Gene from Phoma sp
Nobuyuki Kashiwa, Yutaka Ebizuka, Isao Fujii Chem Pharm Bull (Tokyo). 2016;64(7):947-51. doi: 10.1248/cpb.c16-00172.
Non-reducing iterative type I polyketide synthase genes, pnk1 and pnk2, were cloned from the fungus Phoma sp. BAUA2861, which produces the topoisomerase I inhibitors, topopyrones A to D. Heterologous expression of these polyketide synthase genes under the α-amylase promoter in Aspergillus oryzae was carried out to identify their functions. The pnk2 transformant produced topopyrones C, D, and haematommone. Therefore, the pnk2 gene was found to encode for the topopyrone nonaketide synthase.
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Bio Calculators
* Our calculator is based on the following equation:
Concentration (start) x Volume (start) = Concentration (final) x Volume (final)
It is commonly abbreviated as: C1V1 = C2V2
* Total Molecular Weight:
g/mol
Tip: Chemical formula is case sensitive. C22H30N4O √ c22h30n40 ╳
