The objectives of this research involve the synthesis and characterization of synthetic analogues of various heme proteins. The reactions of interest include 1) O2, CO and ligand binding by hemoglobin, myoglobin and nonmammalian hemoproteins, 2) O2 activation and hydrocarbon hydroxylation by the monooxygenase cytochrome P-450, and 3) the reaction with and reduction of oxidants by catalase and peroxidase. These enzymes are relevant to cardiovascular functioning; drug, hormone and exobiotic metabolism; and to oxidant detoxification and substrate oxidation. Our studies are directed towards an understanding of the molecular mechanisms of these reactions in closely related model metalloporphyrins. We have synthesized, characterized and quantitatively studied the O2 and other ligand binding to a series of porphyrinatoiron (II) complexes. Of special interest is our """"""""bis-pocket"""""""" porphyrin, which provides protected pockets on both faces of the macrocycle and which is extremely oxidatively robust. The non-polar nature of this porphyrin's pockets allows us quantitate the contribution of polarity, hydrogen bonding and other factors of O2 and Co affinities. This porphyrin has also proved useful in dramatically stabilizing high oxidation state complexes which may be analogous to Compounds I and II of peroxidase and catalase and to the active hydroxylase species of cytochrome P-450. In addition, the steric protection of the pocket favors terminal hydroxylation and epoxidation, demonstrating shape-selective substrate recognition. Additional work has been carried out on highly oxidized single atom bridged iron porphyrin dimers which has demonstrated the sensitivity of electronic structure in such systems to the nature of ligation. Continuation of our efforts in these areas should lead to a quantitative understanding of the influences which modulate O2 and CO binding, to the full characterization and isolation of synthetic analogs of high oxidation state heme protein intermediates, and to a closer understanding of substrate shape selectivity and regiospecificity by monooxygenases.
| Suh, Won Hyuk; Suslick, Kenneth S; Stucky, Galen D et al. (2009) Nanotechnology, nanotoxicology, and neuroscience. Prog Neurobiol 87:133-70 |
| Wang, Jiangyun; Rosenblatt, Michael M; Suslick, Kenneth S (2007) NMR structures of peptide--RuII(porphyrin) complexes. J Am Chem Soc 129:14124-5 |
| Dibbern, Elizabeth M; Toublan, Farah Jean-Jacques; Suslick, Kenneth S (2006) Formation and characterization of polyglutamate core-shell microspheres. J Am Chem Soc 128:6540-1 |
| Toublan, Farah Jean-Jacques; Boppart, Stephen; Suslick, Kenneth S (2006) Tumor targeting by surface-modified protein microspheres. J Am Chem Soc 128:3472-3 |
| Zhang, Chen; Bailey, Daniel P; Suslick, Kenneth S (2006) Colorimetric sensor arrays for the analysis of beers: a feasibility study. J Agric Food Chem 54:4925-31 |
| Janzen, Michael C; Ponder, Jennifer B; Bailey, Daniel P et al. (2006) Colorimetric sensor arrays for volatile organic compounds. Anal Chem 78:3591-600 |
| Rakow, Neal A; Sen, Avijit; Janzen, Michael C et al. (2005) Molecular recognition and discrimination of amines with a colorimetric array. Angew Chem Int Ed Engl 44:4528-32 |
| Didenko, Yuri T; Suslick, Kenneth S (2005) Chemical aerosol flow synthesis of semiconductor nanoparticles. J Am Chem Soc 127:12196-7 |
| Suslick, Kenneth S; Bhyrappa, P; Chou, J-H et al. (2005) Microporous porphyrin solids. Acc Chem Res 38:283-91 |
| Zhang, Chen; Suslick, Kenneth S (2005) A colorimetric sensor array for organics in water. J Am Chem Soc 127:11548-9 |
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