In situ growth of a PEG-like polymer from the C terminus of an intein fusion protein improves pharmacokinetics and tumor accumulation.

Abstract:

:This paper reports a general in situ method to grow a polymer conjugate solely from the C terminus of a recombinant protein. GFP was fused at its C terminus with an intein; cleavage of the intein provided a unique thioester moiety at the C terminus of GFP that was used to install an atom transfer radical polymerization (ATRP) initiator. Subsequent in situ ATRP of oligo(ethylene glycol) methyl ether methacrylate (OEGMA) yielded a site-specific (C-terminal) and stoichiometric conjugate with high yield and good retention of protein activity. A GFP-C-poly(OEGMA) conjugate (hydrodynamic radius (R(h)): 21 nm) showed a 15-fold increase in its blood exposure compared to the protein (R(h): 3.0 nm) after intravenous administration to mice. This conjugate also showed a 50-fold increase in tumor accumulation, 24 h after intravenous administration to tumor-bearing mice, compared to the unmodified protein. This approach for in situ C-terminal polymer modification of a recombinant protein is applicable to a large subset of recombinant protein and peptide drugs and provides a general methodology for improvement of their pharmacological profiles.

authors

Gao W,Liu W,Christensen T,Zalutsky MR,Chilkoti A

doi

10.1073/pnas.1006044107

subject

Has Abstract

pub_date

2010-09-21 00:00:00

pages

16432-7

issue

38

eissn

0027-8424

issn

1091-6490

pii

1006044107

journal_volume

107

pub_type

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