Allosteria

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Hemoglobin in T (form Deoxy) and R (form Oxy). The attachment of one oxygen molecule causes the transition of hemoglobin from T to R form, which facilitates the attachment of further oxygen molecules.

Allostery - change the affinity of a chemical protein to a molecule (eg enzymes for substrates or transport proteins to their charge) by changing the spatial structure.

Allosteric effects play an important role in the regulation of enzymatic activity. An example is allosteric inhibition, that is, a decrease in the catalytic activity of an enzyme by altering its conformation due to the attachment of the inhibitor to a different place than the active site.

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