GLOSSARY

Positive Allosteric Modulator enhances the assessed function through allosteric modulation.

Allosteric regulation changes activity through communication between regulatory binding and functional regions; it can activate or inhibit. Feedback carries downstream-product or state information upstream, whereas feedforward conveys input or upstream information onward. Both can operate in one network. Regulation coordinates supply and use rather than keeping every enzyme maximally active, so more activation is not automatically a better nutritional or training outcome.

The active site combines substrate recognition and reaction chemistry; catalytic site emphasizes reaction-performing components, while binding site emphasizes recognition. A regulatory site may be separate and alter activity through an effector. Binding away from the active site does not automatically produce pure noncompetitive inhibition. Binding location and kinetic behavior must be described separately rather than treating all distant binding as one inhibition pattern.

For example, after training changes an enzyme result, first ask whether it was measured in blood, tissue or purified protein. Then assess assay conditions, nutrition and time since the last session alongside actual performance; this comparison helps distinguish a regulatory response from a nutritional deficiency or a presumed supplement need.

Cooperativity means that binding or state in one part affects another part's behavior. Positive and negative describe the direction of that effect rather than health benefit or harm. A Hill coefficient is an empirical response-slope measure, not necessarily an exact count of binding sites. Sigmoidal and hyperbolic responses differ, but curve shape alone cannot identify every molecular step or establish a complete regulatory mechanism.