THREE-DIMENSIONAL SOLUTION STRUCTURE OF THE CYANIDE ADDUCT OF A MET80ALA VARIANT OF SACCHAROMYCES CEREVISIAE ISO-1-CYTOCHROME C. IDENTIFICATION OF LIGAND-RESIDUE INTERACTIONS IN THE DISTAL HEME CAVITY
Three-Dimensional Solution Structure of the Cyanide Adduct of a met80Ala Variant of Saccharomyces Cerevisiae Iso-1-Cytochrome C. Identification of Ligand-Residue Interactions in the Distal Heme Cavity
The 1H NMR spectrum of the the cyanide adduct of a triply mutated Saccharomyces cerevisiae iso-1-cytochrome c (His39Gln/Met80Ala/Cys102Ser) in the oxidized form has been assigned through 1D NOE and 2D COSY, TOCSY, NOESY, and NOE-NOESY experiments; 562 protons out of a total of 683 have been assigned ...
The 1H NMR spectrum of the the cyanide adduct of a triply mutated Saccharomyces cerevisiae iso-1-cytochrome c (His39Gln/Met80Ala/Cys102Ser) in the oxidized form has been assigned through 1D NOE and 2D COSY, TOCSY, NOESY, and NOE-NOESY experiments; 562 protons out of a total of 683 have been assigned. The solution structure, the first of a paramagnetic heme protein, was determined using 1426 meaningful NOE constraints out of a total of 1842 measured NOEs. The RMSD values at the stage of restrained energy minimization of 17 structures obtained from distance geometry calculations are 0.68 +/- 0.11 and 1.32 +/- 0.14 A for the backbone and all heavy atoms, respectively. The quality, in terms of RMSD, of the present structure is the same as that obtained for the solution structure of the diamagnetic horse heart ferrocytochrome c [Qi, P. X., et al. (1994) Biochemistry 33, 6408-6419]. The secondary structure elements and the overall folding in the variant are observed to be the same as those of the wild-type protein for which the X-ray structure is available. However, the replacement of the methionine axial ligand with an alanine residue creates a ligand-binding "distal cavity". The properties of the distal cavity seen in this solution structure are compared to those of other heme proteins.
Related Citations:
Paramagnetic 1H NMR Spectroscopy of the Cyanide Derivative of met80Ala-Iso-1-Cytochrome C Bren, K.L., Gray, H.B., Banci, L., Bertini, I., Turano, P. () To be published --: --
Structurally Engineered Cytochromes with Unusual Ligand-Binding Properties: Expression of Saccharomyces Cerevisiae met80-->Ala Iso-1-Cytochrome C Lu, Y., Casimilo, D.R., Bren, K.L., Richards, J.H., Gray, H.B. (1993) Proc Natl Acad Sci U S A 90: 11456
Organizational Affiliation:
Department of Chemistry, University of Florence, Italy.
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