activator definition biology
The Escherichia coli catabolite gene activator protein (CAP) is a DNA binding protein involved with the transcription of several genes, including those that code for enzymes involved in the metabolism of certain sugars (i.e. lactose, maltose, and arabinose.) Basically, CAP is responsible for the global regulation of carbon utilization. DNA Sequence Determinants for Binding of the Escherichia coli Catabolite Gene Activator Protein. The Journal of Biological Chemistry 267:14713-14720. Schultz, Steve C., George C. Shields, and Thomas A. Steitz. 1991. Crystal Structure of a CAP-DNA complex: The DNA Is Bent by 90 degrees Science 253: 1001-1007. Orthodontics. a removable appliance, usually of hard plastic, that is worn in the mouth instead of a fixed appliance to help align the teeth and improve the relationship of the lower jaw to the upper. Origin of activator. activate + -or2. Identification of the activating region of catabolite gene activator protein (CAP): Isolation and characterization of mutants of CAP specifically defective in transcription activation. Proceedings of the National Academy of Sciences of the United States of America 90:6081-6085. 4. the deliberate induction of a pattern of electrical activity in the brain. 1  allosteric activation increase in enzyme activity by binding of an effector at an allosteric site that affects binding or turnover at the catalytic site. contact activation initiation of the intrinsic pathway of coagulation through interaction of coagulation factor XII with various electronegative surfaces. in fusion research, where deuterium-tritium is a common fuel mixture, the neutron released when (D _ T) combine to form (4He _ n) can activate the reactor structure. In this case the 4He is inert, the neutron sticks to another nucleus, and the neutron _ nucleus reaction creates an actvation product. activator - (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription. 1  substance - the real physical matter of which a person or thing consists; DNA is the substance of our genes. Biochemistry The conversion, often enzymatic, of a molecule to a functionally active form—e.g., activation of complement or coagulation cascades. Haematology See Plasminogen activation. Immunology See Complement activation, Lymphocyte activation, Macrophage activation, T cell activation. Medical Definition of Operon. Operon: A set of genes transcribed under the control of an operator gene. More specifically, an operon is a segment of DNA containing adjacent genes including structural genes, an operator gene, and a regulatory gene. An operon is thus a functional unit of transcription and genetic regulation. You can then flash decoy signs and just an activator to set the play in action. These sensors have no moving parts but sense the position of a steel activator attached to the sensed assemble using an inductive detection concept. The activator softens the top layer of the transfer so it can bond to the substrate.
Any agency bringing about activation, a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription.