Little Jack Horner in the Tudor period. The song’s most common lyrics are: <poem style="margin-left:24px> Little Jack Horner Sat in the corner, Eating his Christmas pie; He put in his thumb, And pulled out a plum, And said, "What a good boy am I!"</poem> It was first documented in full in the nursery rhyme collection "Mother Goose's melody, or, Sonnets for the cradle", which may date from 1765, although the earliest surviving English edition is from 1791. The melody commonly associated with the rhyme was first recorded by the composer and nursery rhyme collector James William Elliott in his "National Nursery Rhymes and
S-ribosylhomocysteine lyase S-ribosylhomocysteine lyase In enzymology, a S-ribosylhomocysteine lyase () is an enzyme that catalyzes the chemical reaction Hence, this enzyme has one substrate, S-(5-deoxy-D-ribos-5-yl)-L-homocysteine, and two products, L-homocysteine and (4S)-4,5-dihydroxypentan-2,3-dione. This enzyme belongs to the family of lyases, specifically the class of carbon-sulfur lyases. The systematic name of this enzyme class is S-(5-deoxy-D-ribos-5-yl)-L-homocysteine L-homocysteine-lyase [(4S)-4,5-dihydroxypentan-2,3-dione-forming]. Other names in common use include S-ribosylhomocysteinase, and LuxS. This enzyme participates in methionine metabolism. Furthermore, LuxS is involved in the synthesis of autoinducer AI-2 (autoinducer-2), which plays a role in quorum sensing in a certain number of bacterial species. LuxS converts S-ribosylhomocysteine to homocysteine and