[Effect of physico-chemical factors and species specificity on the structure of dinitrosyl iron complexes]

Formation in mouse, rat and man's blood of iron nitrosyl complexes with pair thiol groups of proteins (complexes 2.03) was shown by ESR method. This formation was initiated by the introduction in blood in vitro or in vivo of low molecular dinitrosyl complexes of iron with phosphate, thiosulphate, cysteine or reduced gluthatione. Three forms of these complexes were found. They were characterized by ESR signals with rhombic or axial symmetry of g-factor tensor. These forms pass into one another under the effect of a number of thiol-containing compounds or at blood freezing. The life time of the complexes 2.03 in the blood in vivo is several hours.