Interacting selectively with potassium (K+) ions.

Catalysis of the reaction: NADP+ + 5,6,7,8-tetrahydropteridine = NADPH + H+ + 6,7-dihydropteridine.

Catalysis of the reaction: 2-amino-4-hydroxy-6-hydroxymethyl-7,8-dihydropteridine diphosphate + 4-aminobenzoate = diphosphate + dihydropteroate.

Interacting selectively with Tat, a viral transactivating regulatory protein from the human immunodeficiency virus, or the equivalent protein from another virus.

Catalysis of the reaction: 5,6-dihydrouracil + H2O = 3-ureidopropionate.

Catalysis of the reaction: (S)-dihydroorotate + O2 = orotate + H2O2.

The chemical reactions involving pectin, a polymer containing a backbone of alpha-1,4-linked D-galacturonic acid residues.

Catalysis of the hydrolytic cleavage of the terminal or penultimate peptide bond at the C-terminal end of a peptide or polypeptide.

Coordination of the recruitment and organization of other non-R8 photoreceptors by the R8 photoreceptor.

Catalysis of the hydrolysis of C-terminal amino acid residues from oligopeptides or polypeptides; a bivalent cation is an essential component of the catalytic mechanism.

A change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of an ethanol stimulus.

Catalysis of the reaction: peptidyl-L-amino acid + H2O = peptide + L-amino acid. Little or no action with -Asp, -Glu, -Arg, -Lys or -Pro.

A change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a ether stimulus.

Interacting selectively with double-stranded DNA containing one or more mismatches.

Catalysis of the reaction: peptidyl-L-lysine (or peptidyl-L-arginine) + H2O = peptide + L-lysine (or L-arginine). Function is activated by Co2+ and inhibited by 1,10-phenanthroline and other chelating agents.

Catalysis of the reaction: peptidyl-L-lysine (or peptidyl-L-arginine) + H2O = peptide + L-lysine (or L-arginine). Release of a C-terminal basic amino acid, preferentially lysine; inactivates bradykinin and anaphylatoxins in blood plasma.