ArticleJournal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry2004
The 40s Omega-loop plays a critical role in the stability and the alkaline conformational transition of cytochrome c.
Article in Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry, 2004. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 7 papers.
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7 citing papers in PubMed.
- Surface Engineering of Gold Nanorods for CytochromeACS omega · 2018Article
- Rapid Rapamycin-Only Induced Osteogenic Differentiation of Blood-Derived Stem Cells and Their Adhesion to Natural and Artificial Scaffolds.Stem cells international · 2017Article
- Extended cardiolipin anchorage to cytochrome c: a model for protein-mitochondrial membrane binding.Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2010Article
- Spectroscopic, structural, and functional characterization of the alternative low-spin state of horse heart cytochrome C.Biophysical journal · 2008Article
- Conformational stability and dynamics of cytochrome c affect its alkaline isomerization.Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2007Article
- Insights into the role of the histidines in the structure and stability of cytochrome c.Journal of biological inorganic chemistry : JBIC : a publication of the Society of Biological Inorganic Chemistry · 2006Article
- ATP specifically drives refolding of non-native conformations of cytochrome c.Protein science : a publication of the Protein Society · 2005Article
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Abstract
The structural and redox properties of a non-covalent complex reconstituted upon mixing two non-contiguous fragments of horse cytochrome c, the residues 1-38 heme-containing N-fragment with the residues 57-104 C-fragment, have been investigated. With respect to native cyt c, the complex lacks a segment of 18 residues, corresponding, in the native protein, to an omega (Omega)-loop region. The fragment complex shows compact structure, native-like alpha-helix content but a less rigid atomic packing and reduced stability with respect to the native protein. Structural heterogeneity is observed at pH 7.0, involving formation of an axially misligated low-spin species and consequent partial displacement of Met80 from the sixth coordination position of the heme-iron. Spectroscopic data suggest that a lysine (located in the Met80-containing loop, namely Lys72, Lys73, or Lys79) replaces the methionine residue. The residues 1-38/57-104 fragment complex shows an unusual biphasic alkaline titration characterized by a low (p K(a1)=6.72) and a high p K(a)-associated state transition (p K(a2)=8.56); this behavior differs from that of native cyt c, which shows a monophasic alkaline transition (p K(a)=8.9). The data indicate that the 40s Omega-loop plays an important role in the stability of cyt c and in ensuring a correct alkaline conformational transition of the protein.
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