Ananain
Definition:
EC Tree > 3 Hydrolases > 3.4 Acting on peptide bonds (peptidases) > 3.4.22 Cysteine endopeptidases > 3.4.22.31 Ananain
Ananain is a cysteine endopeptidase from the stem of pineapple (Ananas comosus), distinguished from stem and fruit bromelains by being inhibited by chicken cystatin. It belongs to peptidase family C1 (papain family) and hydrolyzes proteins with broad specificity; the best reported small-molecule substrate is Bz-Phe-Val-Arg-NHMec, but its specificity is broader than that of fruit bromelain. In the plant it contributes to tissue remodeling and defense. It features a papain-like catalytic fold.
Ananain is a cysteine endopeptidase from the stem of pineapple (Ananas comosus), distinguished from stem and fruit bromelains by being inhibited by chicken cystatin. It belongs to peptidase family C1 (papain family) and hydrolyzes proteins with broad specificity; the best reported small-molecule substrate is Bz-Phe-Val-Arg-NHMec, but its specificity is broader than that of fruit bromelain. In the plant it contributes to tissue remodeling and defense. It features a papain-like catalytic fold.
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