Effects of the protein environment on the structure and energetics of active sites of metalloenzymes. ONIOM study of methane monooxygenase and ribonucleotide reductase

Maricel Torrent, Thom Vreven, Djamaladdin G. Musaev, Keiji Morokuma, Ödön Farkas, H. Bernhard Schlegel

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Abstract

As the first application of our recently developed ONIOM2(QM:MM) and ONIOM3(QM:QM:MM) codes to the metalloenzymes with a large number of protein residues, two members of the non-heme protein family, methane monooxygenause and ribonucleotide reductase, have been chosen. The "active-site + four α-helical fragments" model was adopted which includes about 1000 atoms from 62 residues around the Fe-centered spheres. Comparison of the active-site geometries of MMOH and R2 units optimized with this model with those obtained with the "active site only" (with only 39-46 atoms) model and the X-ray results clearly demonstrates the crucial role of the active site-protein interaction in the enzymatic activities.

Original languageEnglish
Pages (from-to)192-193
Number of pages2
JournalJournal of the American Chemical Society
Volume124
Issue number2
DOIs
Publication statusPublished - Jan 16 2002

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ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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