1fhb
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
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OverviewOverview
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.
About this StructureAbout this Structure
1FHB is a Single protein structure of sequence from Saccharomyces cerevisiae with CYN, HEM and TML as ligands. Full crystallographic information is available from OCA.
ReferenceReference
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., Banci L, Bertini I, Bren KL, Gray HB, Sompornpisut P, Turano P, Biochemistry. 1995 Sep 12;34(36):11385-98. PMID:7547866
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