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. Author manuscript; available in PMC: 2014 Dec 16.
Published in final edited form as: Nat Chem. 2011 Dec 15;4(1):13–14. doi: 10.1038/nchem.1230

Figure 1.

Figure 1

The effect of polymer conjugation on peptide therapeutics. Attaching PEG chains imposes steric hindrance and introduces interactions that compete with substrate binding. Attaching a poly(zwitterion) can help to draw water away from the active site and shift the equilibrium to favour substrate binding.