Geometry binding site

G. M. Crippen, Quant. Struct.-Act. Relat., 2, 95 (1983). Prediction of New Leads from a Distance Geometry Binding Site Model. 

Self-assembled structures can be closed if all the potential binding sites are utilized, or open if they are not. Closed assemblies have a definite geometry and stoichiometry, while open assemblies exist as mixtures of oligomers or polymers of varying stoichiometry. In addition, the self-assembled structure can be classified as cooperative if the multiple binding interactions reinforce each other to yield enhanced stability, or trivial if the binding interactions do not cooperate in the... 

The very high resolution for the ESR spectrum of cob(II)alamin in the enzyme system is undoubtedly due to the fact that all the coenzyme molecules are bound in an identical environment at the enzyme active site. This results in a homogeneous cobalt-benzimidazole geometry, because both identical binding sites, solvent, and solute molecules can no longer approach the Bia-molecule closely. In addition, the enzyme bound cob(II)alamin molecules are more isolated from one another and thus relaxation due to spin-spin interactions is less effective in broadening spectral lines. 

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