... cata-lysis (the C-terminal residues of each b-strand and the loops that connect each strand, bn, to the followinghelix, an) from those that stabilize the overall fold (the core b-barrel and the ... untested, and the absence of a robust system somewhat limits the potential forredesigning these proteins. The (ba)8-barrel proteinsare predominantly cytoplasmic, often co-ordinatecofactors ... display, and foraddressing the hypothesis that the active-site-formingloops of (ba)8-barrel proteins could be regarded asmodular with respect to the rest of the scaffold. PRAIcatalyzes the Amadori...