The formation from simpler components of any of a group of physiologically important biogenic amines that possess a catechol (3,4-dihydroxyphenyl) nucleus and are derivatives of 3,4-dihydroxyphenylethylamine.

The breakdown into simpler components of any of a group of physiologically important biogenic amines that possess a catechol (3,4-dihydroxyphenyl) nucleus and are derivatives of 3,4-dihydroxyphenylethylamine.

Catalysis of the transfer of a methyl group from S-adenosyl-L-methionine to a substrate.

The breakdown into simpler components of choline (2-hydroxyethyltrimethylammonium), an amino alcohol that occurs widely in living organisms as a constituent of certain types of phospholipids and in the neurotransmitter acetylcholine.

negative regulation of nucleoside metabolism

Any process that stops, prevents or reduces the rate, frequency or extent of the chemical reactions involving nucleosides.

The formation from simpler components of serotonin (5-hydroxytryptamine), a monoamine neurotransmitter occurring in the peripheral and central nervous systems, also having hormonal properties.

The chemical reactions involving serotonin (5-hydroxytryptamine), a monoamine neurotransmitter occurring in the peripheral and central nervous systems, also having hormonal properties.

The breakdown into simpler components of serotonin (5-hydroxytryptamine), a monoamine neurotransmitter occurring in the peripheral and central nervous systems, also having hormonal properties.

Any process that stops, prevents or reduces the rate, frequency or extent of exocytosis.

Catalysis of the reaction: CTP + N-acylneuraminate = diphosphate + CMP-N-acylneuraminate.

Any process that activates or increases the rate, frequency or extent of exocytosis.

negative regulation of fatty acid metabolism

Any process that stops, prevents or reduces the rate, frequency or extent of the chemical reactions involving fatty acids.

Catalysis of the reaction: agmatine + H2O = putrescine + urea.

positive regulation of fatty acid metabolism