Molecular genetic analysis of a plant virus polyprotein cleavage site: a model.

By W. Dougherty, S. M. Cary, T. Parks. 1989

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Tobacco etch virus protease: mechanism of autolysis and rational design of stable mutants with wild-type catalytic proficiency. (2001, methodology): “They are also among the least favorable substitutions at these positions in a canonical TEV protease recognition site (Dougherty et al., 1988, 1989).”
An Overview of Enzymatic Reagents for the Removal of Affinity Tags (2011, background): “An important footnote to early studies of TEV protease specificity that is sometimes overlooked by today’s protein engineers is that proline (but no other residue) is decidedly inhibitory in the P20 position of its substrates [66].”