Effect of Polymer Chain Density on Protein–Polymer Conjugate Conformation

Daniela Russo*, Andrea de Angelis, Christopher J. Garvey, Frederick R. Wurm, Marie-Sousai Appavou, Sylvain Prevost

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

20 Citations (Scopus)
1 Downloads (Pure)

Abstract

Many biomedical applications employ covalent attachment to synthetic polymers to enhance the efficiency of proteins or other therapeutically active molecules. We report here the impact of polymer conjugation on the structural and thermal stability of a protein model, the bovine serum albumin, using a variable number of linear biodegradable polyphosphoesters, which were covalently tethered to the protein. We observed that BSA’s secondary structure measured by circular dichroism is independent of the conjugation. Small-angle neutron scattering, however, reveals a change from ellipsoid to globular shape of the whole complex arising from a slight compaction of the protein core and an increase of the polymer’s radius of gyration as a function of the grafting polymer density. In particular, we highlight a gradual change of the polymer conformation around the protein and elongation of the semimajor dimension of the ellipsoidal protein. Our results will contribute to the description of biophysical characteristics of a new class of biologically relevant protein–polymer conjugates.
Original languageEnglish
Pages (from-to)1944-1955
JournalBiomacromolecules
Volume20
Issue number5
DOIs
Publication statusPublished - 13 May 2019
Externally publishedYes

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