Structure and functional dynamics of the mitochondrial Fe/S cluster synthesis complex

• Autor: Boniecki, Michal T ; Freibert, Sven A ; Mühlenhoff, Ulrich ; Lill, Roland ; Cygler, Miroslaw
• Assuntos: Acyl carrier protein ; Acyl Carrier Protein - chemistry ; Acyl Carrier Protein - genetics ; Acyl Carrier Protein - metabolism ; Amino Acid Sequence ; Amino Acid Substitution ; Carbon-Sulfur Lyases - chemistry ; Carbon-Sulfur Lyases - genetics ; Carbon-Sulfur Lyases - metabolism ; Catalysis ; Chaetomium - chemistry ; Chaetomium - genetics ; Chemical synthesis ; Clusters ; Cofactors ; Crystal structure ; Crystallography ; Crystallography, X-Ray ; Deoxyribonucleic acid ; DNA ; Energy balance ; Energy conversion ; Ferredoxin ; Frataxin ; Fungal Proteins - chemistry ; Fungal Proteins - genetics ; Fungal Proteins - metabolism ; Humans ; Iron ; Iron-Binding Proteins - chemistry ; Iron-Binding Proteins - genetics ; Iron-Binding Proteins - metabolism ; Iron-Regulatory Proteins - chemistry ; Iron-Regulatory Proteins - genetics ; Iron-Regulatory Proteins - metabolism ; Iron-Sulfur Proteins - chemistry ; Iron-Sulfur Proteins - genetics ; Iron-Sulfur Proteins - metabolism ; Lipids ; Mitochondria ; Mitochondria - metabolism ; Mitochondrial Proteins - chemistry ; Mitochondrial Proteins - genetics ; Mitochondrial Proteins - metabolism ; Models, Molecular ; Molecular Dynamics Simulation ; Multiprotein Complexes - chemistry ; Multiprotein Complexes - metabolism ; Mutagenesis, Site-Directed ; Protein Conformation ; Protein Multimerization ; Protein Stability ; Proteins ; Saccharomyces cerevisiae Proteins - chemistry ; Saccharomyces cerevisiae Proteins - genetics ; Saccharomyces cerevisiae Proteins - metabolism ; Scattering, Small Angle ; Sequence Homology, Amino Acid ; Small angle X ray scattering ; Static Electricity ; Sulfur ; X-Ray Diffraction ; X-ray scattering
• É parte de: Nature communications, 2017-11, Vol.8 (1), p.1287-15, Article 1287
• Descrição: Iron-sulfur (Fe/S) clusters are essential protein cofactors crucial for many cellular functions including DNA maintenance, protein translation, and energy conversion. De novo Fe/S cluster synthesis occurs on the mitochondrial scaffold protein ISCU and requires cysteine desulfurase NFS1, ferredoxin, frataxin, and the small factors ISD11 and ACP (acyl carrier protein). Both the mechanism of Fe/S cluster synthesis and function of ISD11-ACP are poorly understood. Here, we present crystal structures of three different NFS1-ISD11-ACP complexes with and without ISCU, and we use SAXS analyses to define the 3D architecture of the complete mitochondrial Fe/S cluster biosynthetic complex. Our structural and biochemical studies provide mechanistic insights into Fe/S cluster synthesis at the catalytic center defined by the active-site Cys of NFS1 and conserved Cys, Asp, and His residues of ISCU. We assign specific regulatory rather than catalytic roles to ISD11-ACP that link Fe/S cluster synthesis with mitochondrial lipid synthesis and cellular energy status.
  
• Editor: England: Nature Publishing Group
  
• Idioma: Inglês