Ferredoxins are a group of iron–sulfur proteins for which a wealth of structural and mutational data have recently become available previously unknown structures of ferredoxins which are adapted to halophilic, acidophilic or hyperthermophilic environments and new cysteine patterns for cluster ligation and non-cysteine cluster ligation have been described. The rieske [2fe-2s] iron-sulfur protein of cytochrome bc 1 functions as the initial electron acceptor in the rate-limiting step of the catalytic reaction prior studies have established roles for a number of conserved residues that hydrogen bond to ligands of the [2fe-2s] cluster.
In a number of iron–sulfur proteins, the [fe 4 s 4] cluster can be reversibly converted by oxidation and loss of one iron ion to a [fe 3 s 4] cluster eg, the inactive form of aconitase possesses an [fe 3 s 4 ] and is activated by addition of fe 2+ and reductant.
Under normal conditions, sulfur atoms form a cyclic molecule called octatomic that chemical formula is s8 sulfur has bright yellow crystalline that is in a solid form at room temperature chemically, sulfur can react as a reduction agent or an oxidant it oxidizes several nonmetals and most common metals.
Beinert h (2000) iron‐sulfur proteins: ancient structures, still full of surprises journal of biological inorganic chemistry 5: 2–15 blanc b, clémancey m, latour jm, fontecave m and ollagnier de choudens s (2014) molecular investigation of iron‐sulphur cluster assembly scaffolds under stress. Iron–sulfur proteins: structure, function and biogenesis frédéric barras, aix marseille université, cnrs, laboratoire de chimie bactérienne, umr, marseille, france.
Structures, biosynthesis and biofunctions of iron-sulfer proteins yiming chen, brown university, may 11th, 2011 i introduction iron-sulfur proteins are the proteins which contain iron-sulfur clusters, like sulfide-linked di-, tri-, and tetrairon centers with various oxidative states 1.
I will describe the known three-dimensional structures of the iron-sulfur proteins and the analog compounds that are models for them and then discuss some observations relating the structure and the function of these intriguing molecules.
This suggests that the type of interactions that increase thermostability may not be identical even within a single class of proteins 4 high-potential iron–sulfur proteinshigh-potential iron–sulfur proteins (hipips) are a class of small proteins (62–85 amino acids) which contain a single [4fe–4s]-cluster.