Phosphorylase

Part of speech: noun

Definitions

1. An enzyme that catalyzes the addition of a phosphate group to a molecule, particularly in the breakdown of glycogen to glucose-1-phosphate
2. A key player in carbohydrate metabolism, facilitating the conversion of glycosyl residues into phosphorylated forms
3. A crucial protein in biochemical pathways that regulates energy release by controlling the phosphorylation of carbohydrates

Etymology: Phosphorylase takes its name from a chemical root and a suffix, and the suffix is the more interesting part. "-ase" was borrowed from "diastase", the first enzyme ever isolated, a name built from Greek roots meaning roughly "to stand apart". Chemists then began applying "-ase" to any enzyme, so the ending became a signal that a word names a biological catalyst rather than a simple compound. The first part, "phosphoryl", is a chemical term for the phosphorus-containing group that these enzymes add to or remove from sugar molecules. "Phosphor-" comes from the element phosphorus, whose name is itself Greek, and "-yl" is the standard chemists' suffix for a radical or group within a molecule. Joined together, the parts describe an enzyme that works on phosphoryl groups.