Stigmatellin

Stigmatellin

Identifiers
CAS Number	91682-96-1
ChEBI	CHEBI:32155
ChEMBL	ChEMBL486556
ChemSpider	394850
Jmol interactive 3D	Image
MeSH	Stigmatellin
PubChem	447884
InChI InChI=1S/C30H42O7/c1-10-18(2)13-11-12-14-22(33-6)21(5)29(36-9)19(3)15-16-23-20(4)27(31)26-24(34-7)17-25(35-8)28(32)30(26)37-23/h10-14,17,19,21-22,29,32H,15-16H2,1-9H3/b13-11+,14-12+,18-10+/t19-,21+,22-,29-/m0/s1 Key: UZHDGDDPOPDJGM-CVOZLMQJSA-N InChI=1/C30H42O7/c1-10-18(2)13-11-12-14-22(33-6)21(5)29(36-9)19(3)15-16-23-20(4)27(31)26-24(34-7)17-25(35-8)28(32)30(26)37-23/h10-14,17,19,21-22,29,32H,15-16H2,1-9H3/b13-11+,14-12+,18-10+/t19-,21+,22-,29-/m0/s1 Key: UZHDGDDPOPDJGM-CVOZLMQJBZ
SMILES O=C\1c2c(O/C(=C/1C)CC[C@H](C)[C@H](OC)[C@H](C)[C@@H](OC)\C=C\C=C\C(=C\C)C)c(O)c(OC)cc2OC
Properties
Chemical formula	C30H42O7
Molar mass	514.65 g/mol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Stigmatellin is a potent inhibitor of the quinol oxidation (Qo) site of the cytochrome bc1 complex in mitochondria and the cytochrome b6f complex of thylakoid membranes.

Stigmatellin is isolated from the myxobacterium Stigmatella aurantica, and contains a 5,7-dimethoxy-8-hydroxychromone aromatic headgroup with a hydrophobic alkenyl chain in position 2 . Crystal structures for stigmatellin-inhibited bovine and yeast (Saccharomyces cerevisiae) bc1 complex are available. Stigmatellin binds at the cytochrome b Qo site in the '(heme) bl distal' position, and associates with the Rieske iron-sulfur protein via a hydrogen bond to histidine residue 181 (His-181), a ligand to the [2Fe2S] iron-sulfur cluster of this subunit. This association raises the midpoint potential of the iron-sulfur cluster from 290 to 540 mV and restricts movement of the cytoplasmic domain of the Rieske protein.

References

• von Jagow, G., and Link, T.A. Methods in Enzymology 126: 253-271 (1986)