pectinesterase

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun An enzyme found in certain plants, bacteria, and fungi that catalyzes the hydrolysis of pectin to pectic acid and methanol.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A ubiquitous cell-wall-associated enzyme that presents several isoforms that facilitate plant cell wall modification and subsequent breakdown, found in all higher plants as well as in some bacteria and fungi.