Multiple display of catalytic modules on a protein scaffold: nano-fabrication of enzyme particles

J Biotechnol. 2007 Sep 30;131(4):433-9. doi: 10.1016/j.jbiotec.2007.07.940. Epub 2007 Jul 26.

Abstract

Self assembly is a prerequisite for fabricating nanoscale structures. Here we present a new fusion protein based on the stress-responsive homo-oligomeric protein, SP1. This ring-shaped protein is a highly stable homododecamer, which can be potentially utilized to self-assemble different modules and enzymes in a predicted and oriented manner. For that purpose, a cohesin module (a component of the bacterial cellulosome) was selected, its gene fused in-frame to SP1, and the fusion protein was expressed in Escherichia coli. The cohesin module, specialized to incorporate different enzymes through specific recognition of a dockerin modular counterpart, is used to display new moieties on the SP1 scaffold. The SP1 scaffold displayed 12 active cohesin modules and specific binding to a dockerin-fused cellulase enzyme from Thermobifida fusca. Moreover, we found a significant increase in specific activity of the scaffold-displayed enzymes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Catalysis
  • Cell Cycle Proteins / metabolism
  • Cellulase / metabolism*
  • Chromatography, Gel
  • Chromosomal Proteins, Non-Histone / metabolism
  • Cohesins
  • Electrophoresis, Polyacrylamide Gel
  • Nanotechnology*
  • Nuclear Proteins / metabolism
  • Protein Structure, Secondary
  • Recombinant Fusion Proteins / chemistry
  • Recombinant Fusion Proteins / metabolism*

Substances

  • Cell Cycle Proteins
  • Chromosomal Proteins, Non-Histone
  • Nuclear Proteins
  • Recombinant Fusion Proteins
  • Cellulase