Simple menaquinones reduce carbon tetrachloride and iron (III).
Cell-free supernatant from Shewanella oneidensis MR-1 reduced carbon tetrachloride to chloroform, a suspension of Fe(III) and solid Fe(III) to iron (II). The putative reducing agent was tentatively identified as menaquinone-1 (MQ-1)-a water-soluble menaquinone with a single isoprenoid residue in the side chain. Synthetic MQ-1 reduced carbon tetrachloride to chloroform and amorphous iron (III) hydroxide to iron (II). To test the generality of this result among menaquinones, the reductive activities of vitamin K(2) (MQ-7)-a lipid-associated menaquinone with 7 or 8 isoprenoid residues-was evaluated. This molecule also reduced carbon tetrachloride to chloroform and iron (III) to iron (II). The results indicate that molecules within the menaquinone family may contribute to both the extracellular and cell-associated reduction of carbon tetrachloride and iron (III).
Fu
Q Shiang
QS
Department of Civil and Environmental Engineering, Stanford University, Stanford, CA 94305-4020, USA. shiangfu@stanford.edu
Boonchayaanant
Benjaporn
B
Tang
Weiping
W
Trost
Barry M
BM
Criddle
Craig S
CS
D002251:Carbon Tetrachloride / Q000378:metabolism*; D007501:Iron / Q000378:metabolism*; D015394:Molecular Structure; D010084:Oxidation-Reduction; D020592:Shewanella / Q000378:metabolism; D024482:Vitamin K 2 / Q000737:chemistry / Q000378:metabolism*
D024482:Vitamin K 2; D002251:Carbon Tetrachloride; D007501:Iron