3wi8

Publication Abstract from PubMed

Myoglobin reconstituted with manganese porphycene was prepared in an effort to generate a new biocatalyst and was characterized by spectroscopic techniques. The X-ray crystal structure of the reconstituted protein reveals that the artificial cofactor is located in the intrinsic heme-binding site with weak ligation by His93. Interestingly, the reconstituted protein catalyzes the H2O2-dependent hydroxylation of ethylbenzene to yield 1-phenylethanol as a single product with a turnover number of 13 at 25 degrees C and pH 8.5. Native myoglobin and other modified myoglobins do not catalyze C-H hydroxylation of alkanes. Isotope effect experiments yield KIE values of 2.4 and 6.1 for ethylbenzene and toluene, respectively. Kinetic data, log kobs versus BDE(C(sp(3))-H) for ethylbenzene, toluene, and cyclohexane, indicate a linear relationship with a negative slope. These findings clearly indicate that the reaction occurs via a rate-determining step that involves hydrogen-atom abstraction by a Mn(O) species and a subsequent rebound hydroxylation process which is similar to the reaction mechanism of cytochrome P450.

C(sp3)-H bond hydroxylation catalyzed by myoglobin reconstituted with manganese porphycene.,Oohora K, Kihira Y, Mizohata E, Inoue T, Hayashi T J Am Chem Soc. 2013 Nov 20;135(46):17282-5. doi: 10.1021/ja409404k. Epub 2013 Nov, 7. PMID:24191678^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.