GO:0003674
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molecular_function
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A molecular process that can be carried out by the action of a single macromolecular machine, usually via direct physical interactions with other molecular entities. Function in this sense denotes an action, or activity, that a gene product (or a complex) performs. |
GO:0003824
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catalytic activity
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Catalysis of a biochemical reaction at physiological temperatures. In biologically catalyzed reactions, the reactants are known as substrates, and the catalysts are naturally occurring macromolecular substances known as enzymes. Enzymes possess specific binding sites for substrates, and are usually composed wholly or largely of protein, but RNA that has catalytic activity (ribozyme) is often also regarded as enzymatic. |
GO:0005488
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binding
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The selective, non-covalent, often stoichiometric, interaction of a molecule with one or more specific sites on another molecule. |
GO:0005515
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protein binding
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Binding to a protein. |
GO:0098772
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molecular function regulator activity
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A molecular function regulator regulates the activity of its target via non-covalent binding that does not result in covalent modification to the target. Examples of molecular function regulators include regulatory subunits of multimeric enzymes and channels. Mechanisms of regulation include allosteric changes in the target and competitive inhibition. |
GO:0030234
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enzyme regulator activity
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Binds to and modulates the activity of an enzyme. |
GO:0004857
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enzyme inhibitor activity
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Binds to and stops, prevents or reduces the activity of an enzyme. |
GO:0140678
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molecular function inhibitor activity
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A molecular function regulator that inhibits or decreases the activity of its target via non-covalent binding that does not result in covalent modification to the target. |
GO:0016831
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carboxy-lyase activity
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Catalysis of the nonhydrolytic addition or removal of a carboxyl group to or from a compound. |
GO:0016830
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carbon-carbon lyase activity
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Catalysis of the cleavage of C-C bonds by other means than by hydrolysis or oxidation, or conversely adding a group to a double bond. |
GO:0016829
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lyase activity
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Catalysis of the cleavage of C-C, C-O, C-N and other bonds by other means than by hydrolysis or oxidation, or conversely adding a group to a double bond. They differ from other enzymes in that two substrates are involved in one reaction direction, but only one in the other direction. When acting on the single substrate, a molecule is eliminated and this generates either a new double bond or a new ring. |
GO:0004586
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ornithine decarboxylase activity
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Catalysis of the reaction: L-ornithine + H+ = CO2 + putrescine. |
GO:0008073
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ornithine decarboxylase inhibitor activity
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Binds to and stops, prevents or reduces the activity of ornithine decarboxylase. |
GO:0042979
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ornithine decarboxylase regulator activity
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Binds to and modulates the activity of the enzyme ornithine decarboxylase. |