A class of protein (catalyst) that is capable of accelerating or producing biochemical reactions by binding to and cleaving other proteins.

Substance, made by living cells, that causes specific chemical changes.

(èn¹zìm´), protein functioning as a biological CATALYST. Enzymes accelerate (often by several orders of magnitude) chemical reactions in the cell that would proceed imperceptibly or not at all in their absence. The enzyme is not permanently modified by its participation. Most enzymes demonstrate great specificity, reacting with only one or a small group of closely related chemical compounds; several enzymes are sometimes required for efficient catalytic function. Some enzymes depend on the presence of COENZYMES for their function. For the enzyme to continue to be effective, its three-dimensional molecular structure must be maintained. Over 1,500 different enzymes have been identified, and the exact sequence of AMINO ACIDS (subunits of a protein) has been determined for many through the technique of X-RAY CRYSTALLOGRAPHY. It is believed that an enzyme functions by attaching the molecule it acts on to a specific molecular site, so that the electrostatic forces of nearby atoms sharply reduce the energy needed to cleave and re-form the appropriate chemical bonds. 1 Exogenous

Protein catalyst which drives chemical reactions within a cell. Enzymes display a high degree of specificity with regard to both the substrate on which they act and the type of reaction they catalyze. Enzymes may also be introduced from outside the cell to cause biochemical reactions.

Nucleocapsid Vaginal

Nucleocapsid Transaminase

Oropharynx Vaginal

Papillomavirus Vaginal

linked immunosorbent assay (ELISA) - blood test used to find Helicobacter pylori bacteria; also used to diagnose an ulcer.

Mucocutaneous Ulcer

Mucus Ulcer

Oral Ulceration

Pathogen Vaccine

Neurology Vaccine

Neurotransmitter Toxin

Neurotransmitter Vaccine

Overdose Urethritis

Overdose Toxin

Overdose Torticollis Transgenes

Overdose Topical Toxic

Osteoporosis Veins

Nitrogen Vitiligo

Osteoporosis Vitiligo