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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. |
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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. |
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GO:0016491
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oxidoreductase activity
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Catalysis of an oxidation-reduction (redox) reaction, a reversible chemical reaction in which the oxidation state of an atom or atoms within a molecule is altered. One substrate acts as a hydrogen or electron donor and becomes oxidized, while the other acts as hydrogen or electron acceptor and becomes reduced. |
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GO:0016667
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oxidoreductase activity, acting on a sulfur group of donors
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Catalysis of an oxidation-reduction (redox) reaction in which a sulfur-containing group acts as a hydrogen or electron donor and reduces a hydrogen or electron acceptor. |
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GO:0016668
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oxidoreductase activity, acting on a sulfur group of donors, NAD(P) as acceptor
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Catalysis of an oxidation-reduction (redox) reaction in which a sulfur-containing group acts as a hydrogen or electron donor and reduces NAD or NADP. |
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GO:0050456
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L-cystine reductase (NADH) activity
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Catalysis of the reaction: 2 L-cysteine + NAD+ = L-cystine + H+ + NADH. |
