Diffusion-collision model for the folding kinetics of the lambda-repressor operator-binding domain.
The operator-binding domain of the lambda-repressor contains five alpha-helices and an extended N-terminal arm in the crystal structure determined by Pabo and Lewis reported in Nature 298, 443, 1982 (1). The four helices form a "box" enclosing a hydrophobic core with the fifth helix interacting with the equivalent helix in a dimer. With a small number of well-defined secondary structure elements (microdomains), the repressor is well suited for an analysis of its folding pathways and kinetics by use of the diffusion-collision model. In this paper, the basic elements of the model appropriate to a several microdomain protein are formulated and applied to a set of folding pathways consistent with the crystal structure of the operator-binding domain. The overall kinetics, as well as the time-dependence of intermediate states are determined as a function of the microdomain stability parameter.
D001665:Binding Sites; D004268:DNA-Binding Proteins; D004058:Diffusion; D007700:Kinetics; D008956:Models, Chemical; D009875:Operator Regions, Genetic; D011487:Protein Conformation; D012097:Repressor Proteins; D014157:Transcription Factors; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins
D004268:DNA-Binding Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; C016649:phage repressor proteins