A centrosymmetric projection at 4 Å of horse heart oxidized cytochrome c

A least-squares refinement method for isomorphous replacement

“…The R factors, in contrast, are improved by true secondary sites and worsened by false ones. Examples of this behavior are to be found in Dickerson et aL (1967b).…”

“…(The first power of S was used rather than S z in the exponent of equation (6) for reasons described by Dickerson et al (1967b), but this does not affect the conclusions about A,B behavior.) If B was varied within a considerable range, A was found to refine to a value which best fitted a straight line through the center of gravity of the experimental points on the Wilson plot.…”

HIGH-RESOLUTION PROTON NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY OF CYTOCHROME c

“…W T E the sixth ligand, the NMR spectra yield data on the protein conformation and on the electronic structure of the heme group in ferricytochrome c. For example, a comparison of the spectra in Figure 5 shows that the ring-current 2 …”

Study of Heme‐protein Linkage in Cytochrome b2

“…Recently, by means of X-ray crystallography, the question has been unequivocally solved for hemoglobin-like proteins where one histidine is the single ligand [1,2], and for cytochrome c where one histidine and one methionine are the two ligands [3]. I n b type cytochromes, little is known on this point; by comparison of their spectral characteristics with those of pyridine hemochromogen, it is generally assumed that one or two histidine residues may be implicated.…”