Definition of "serine" [ser•ine]

• An amino acid, CH2OHCH(NH2)COOH, that is a common constituent of many proteins. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "(Dang QD, Di Cera E Residue 225 determines the Na (+) - induced allosteric regulation of catalytic activity in serine proteases."
• "In one investigation, Schmitt found that enzymes called serine-class proteases, which break down proteins in the sprouting grain, can also break down beta-amylase, an important enzyme for converting carbs to simple sugars."
• "In particular, the researchers were focusing on a group of enzymes, called serine hydrolases, that break down proteins, fats, and other molecules in cells."