Purification of FarnesylatedhGBP1 and Characterization of Its Polymerization and Membrane Binding

  • Linda Sistemich
  • Christian HerrmannEmail author
Part of the Methods in Molecular Biology book series (MIMB, volume 2159)


The human guanylate-binding protein 1 (hGBP1) is the best characterized isoform of the seven human GBPs belonging to the superfamily of dynamin-like proteins (DLPs). As known for other DLPs, hGBP1 also exhibits antiviral and antimicrobial activity within the cell. hGBP 1, like hGBPs 2 and 5, carries a CAAX motive at the C-terminus leading to isoprenylation in the living cells. The attachment of a farnesyl anchor and its unique GTPase cycle provides hGBP1 the ability of a nucleotide- stimulated polymerization and membrane binding. In this chapter, we want to show how to prepare farnesylated hGBP1 (hGBP1fn) by bacterial synthesis and by enzymatic modification, respectively, and how to purify the non-farnesylated, as well as the farnesylated hGBP1, by chromatographic procedures. Furthermore, we want to demonstrate how to investigate the special features of polymerization by a UV-absorption-based turbidity assay and the binding to artificial membranes by means of fluorescence energy transfer.

Key words

Large GTPases GBP Farnesylation Membrane binding Polymerization Enzymatic modification Bacterial synthesis FRET Turbidity 


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© Springer Science+Business Media, LLC, part of Springer Nature 2020

Authors and Affiliations

  1. 1.Physical Chemistry I, Faculty of Chemistry and BiochemistryRuhr University BochumBochumGermany

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