Esperamicin

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Esperamicin A1

Identifiers
CAS number	99674-26-7^Y
PubChem	6435576
ChemSpider	4940320^Y
ChEMBL	CHEMBL449274^N
Jmol-3D images	Image 1
SMILES O=C(C(\OC)=C)Nc1cc(OC)c(OC)cc1C(=O)OC2CC(OC(C)C2O)OC7C(=O)C(\NC(=O)OC)=C6/C(=C\CSSSC)C7(O)C#C\C=C/C#CC6OC5OC(C)C(NOC3OC(C)C(SC)C(O)C3)C(O)C5OC4OCC(NC(C)C)C(OC)C4
InChI InChI=1S/C59H80N4O22S4/c1-28(2)60-36-27-77-43(25-39(36)73-8)83-52-50(66)47(63-85-45-24-37(64)53(86-12)31(5)79-45)29(3)80-57(52)82-38-18-16-14-15-17-20-59(71)34(19-21-88-89-87-13)46(38)48(62-58(70)76-11)51(67)54(59)84-44-26-42(49(65)30(4)78-44)81-56(69)33-22-40(74-9)41(75-10)23-35(33)61-55(68)32(6)72-7/h14-15,19,22-23,28-31,36-39,42-45,47,49-50,52-54,57,60,63-66,71H,6,21,24-27H2,1-5,7-13H3,(H,61,68)(H,62,70)/b15-14-,34-19+^Y Key: LJQQFQHBKUKHIS-WJHRIEJJSA-N^Y InChI=1/C59H80N4O22S4/c1-28(2)60-36-27-77-43(25-39(36)73-8)83-52-50(66)47(63-85-45-24-37(64)53(86-12)31(5)79-45)29(3)80-57(52)82-38-18-16-14-15-17-20-59(71)34(19-21-88-89-87-13)46(38)48(62-58(70)76-11)51(67)54(59)84-44-26-42(49(65)30(4)78-44)81-56(69)33-22-40(74-9)41(75-10)23-35(33)61-55(68)32(6)72-7/h14-15,19,22-23,28-31,36-39,42-45,47,49-50,52-54,57,60,63-66,71H,6,21,24-27H2,1-5,7-13H3,(H,61,68)(H,62,70)/b15-14-,34-19+ Key: LJQQFQHBKUKHIS-WJHRIEJJBF
Properties
Molecular formula	C₅₉H₈₀N₄O₂₂S₄
Molar mass	1,325.54 g mol⁻¹
N (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
Infobox references

The esperamicins are a class of bacteria-derived chromoprotein enediyne antibiotics, of which esperamicin A1 is the most well studied. Esperamcin A1 and the related enediyne calicheamicin are the two most potent antitumor agents known.^[1] The esperamicins are extremely toxic DNA splicing compounds.

Oxygen and oxygen scavengers have no significant effect on DNA breakage. The cleavage of DNA by esperamicin is greatly accelerated in the presence of thiol compounds. Oxygen and active oxygen-radical scavengers have no significant influence upon DNA strand breakage by esperamicin. The preferential cutting sites of esperamicin are at thymidylate residues, and the frequency of nucleobase attacked (T greater than C greater than A greater than G) is different from that of calicheamicin (C much greater than T greater than A = G), neocarzinostatin (T greater than A greater than C greater than G), or bleomycin (C greater than T greater than A greater than G).^[2]

References

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