Enzymes
The role of Asp 102 and His 57 during trypsin catalysis is to

clamp the substrate into the active site
neutralize the charge on the other's side chain
keep the specificity pocket open
function as a proton shuttle

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Enzymes
Enzyme-driven metabolic pathways can be made more efficient by

fixing enzymes into membranes so that they are adjacent to each other
grouping enzymes into free-floating, multienzyme complexes
concentrating enzymes within specific cellular compartments
All of these

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