PMID- 16483535 OWN - NLM STAT- MEDLINE DCOM- 20061114 LR - 20161126 IS - 0006-3002 (Print) IS - 0006-3002 (Linking) VI - 1757 IP - 8 DP - 2006 Aug TI - Different types of biological proton transfer reactions studied by quantum chemical methods. PG - 969-80 AB - Different types of proton transfer occurring in biological systems are described with examples mainly from ribonucleotide reductase (RNR) and cytochrome c oxidase (CcO). Focus is put on situations where electron and proton transfer are rather strongly coupled. In the long range radical transfer in RNR, it is shown that the presence of hydrogen atom transfer (HAT) is the most logical explanation for the experimental observations. In another example from RNR, it is shown that a transition state for concerted motion of both proton and electron can be found even if the donors are separated by a quite long distance. In CcO, the essential proton transfer for the OO bond cleavage, and the most recent modelings of proton translocation are described, indicating a few remaining major problems. FAU - Blomberg, Margareta R A AU - Blomberg MR AD - Department of Physics, Stockholm Centre for Physics, Astronomy and Biotechnology (SC-FAB), Stockholm University, Stockholm, Sweden. mb@physto.se FAU - Siegbahn, Per E M AU - Siegbahn PE LA - eng PT - Journal Article PT - Review DEP - 20060125 PL - Netherlands TA - Biochim Biophys Acta JT - Biochimica et biophysica acta JID - 0217513 RN - 0 (Protons) RN - EC 1.17.4.- (Ribonucleotide Reductases) RN - EC 1.9.3.1 (Electron Transport Complex IV) SB - IM MH - Biological Transport MH - Crystallography, X-Ray MH - Electron Transport Complex IV/chemistry/metabolism MH - Models, Molecular MH - Protein Conformation MH - *Protons MH - Quantum Theory MH - Ribonucleotide Reductases/chemistry/metabolism RF - 42 EDAT- 2006/02/18 09:00 MHDA- 2006/11/15 09:00 CRDT- 2006/02/18 09:00 PHST- 2005/11/15 00:00 [received] PHST- 2005/12/20 00:00 [revised] PHST- 2006/01/05 00:00 [accepted] PHST- 2006/02/18 09:00 [pubmed] PHST- 2006/11/15 09:00 [medline] PHST- 2006/02/18 09:00 [entrez] AID - S0005-2728(06)00003-X [pii] AID - 10.1016/j.bbabio.2006.01.002 [doi] PST - ppublish SO - Biochim Biophys Acta. 2006 Aug;1757(8):969-80. doi: 10.1016/j.bbabio.2006.01.002. Epub 2006 Jan 25.