Redox reactions play important roles in almost all biological processes, including
photosynthesis and respiration, which are two essential energy processes that sustain all life …

Nitrite is one of the players in the broad nitrogen biogeochemical cycle. This nitrogen oxo-
anion is involved in key pathways crucial to life on Earth and to the planetary “recycling” of …

Tetrapyrrole-containing proteins are one of the most fundamental classes of enzymes in
nature and it remains an open question to give a chemical rationale for the multitude of …

Proteins play an essential role in biology. Whether it is in catalysis or molecular recognition,
proteins set a golden standard of efficiency and selectivity that few other natural or artificial …

Biological systems rely on heme-proteins to carry out a number of basic functions essential
for their survival. Hemes, or iron–porphyrin complexes, are the versatile and ubiquitous …

The effects of various mechanisms of metalloporphyrin reduction potential modulation were
investigated experimentally using a robust, well-characterized heme protein maquette …

The nucleotide sequence of the hmc operon from Desulfovibrio vulgaris subsp. vulgaris
Hildenborough indicated the presence of eight open reading frames, encoding proteins Orf1 …

The free energy of heme reduction in different proteins is found to vary over more than 18
kcal/mol. It is a challenge to determine how proteins manage to achieve this enormous …

The structure of a cytochrome c 7 (PpcA) from Geobacter sulfurreducens was determined by
X-ray diffraction at 1.45 Å resolution; the R factor is 18.2%. The protein contains a three …

Resonance Raman (RR) spectroscopy, molecular mechanics (MM) calculations, and normal-
coordinate structural decomposition (NSD) have been used to investigate the …