Long-range contacts in protein structures were demonstrated to be predictive of different physiological
properties of hemoglobin and albumin proteins. Complex networks based approach was demonstrated to highlight basic
principles of protein folding and activity. The presence of a natural scaling region ending at an approximate threshold
of 120-150 residues shared by proteins of different size and quaternary structure was highlighted. This threshold is
reminiscent of the typical size for a macromolecule to have a binding site sensible to environmental regulation.
Keywords: Allosteric effect, Bioinformatics, Computational biochemistry, Graph theory, Structural biology, Topological
invariants, Protein contact network, Long-range order, Contact order, Degree based assortativity, Long-range interaction networks, DBA, Assortativity, aminoacids, hemoglobin flexibility, Albumin
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