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Solution properties ofEscherichia coli-expressed VH domain of anti-neuraminidase antibody NC41

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Abstract

The VH domain of anti-influenza neuraminidase antibody NC41, with and without a C-terminal hydrophilic marker peptide (FLAGTM), has been expressed in high yield (15–27 mg/L) inEscherichia coli. Both forms were secreted into the periplasm where they formed insoluble aggregates which were solubilized quantitatively with 2 M guanidine hydrochloride and purified to homogeneity by ion-exchange chromatography. The VH-FLAG was composed of three isoforms (pI values of ∼4.6, 4.9, and 5.3) and the VH molecule was composed of two isoforms with pI values of 5.1 and 6.7; the difference between the VH isoforms was shown to be due to cyclization of the N-terminal glutamine residue in the pI 5.1 isoform. At 20°C and concentrations of 5–10mg/ml the VH domain dimerized in solution and then partly precipitated, resulting in the broadening of resonances in its1H NMR spectrum. Reagents such as CHAPS,n-octylglucoside, and ethylene glycol, which presumably mask the exposed hydrophobic interface of the VH molecule, prevented dimerization of the VH and permitted good-quality NMR spectra on isotope-labeled protein to be obtained.

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Abbreviations

CDR:

complementarity-determining region

CHAPS:

3-[(cholamidopropyl)dimethylammonio]-1-propanesulfonate

2D-TOCSY:

two-dimensional total correlation spectroscopy

FLAG:

hydrophilic octapeptide tail

DYKDDDDK:

Fv, antibody fragment containing variable domains

GuHCL:

guanidine hydrochloride

HRP:

horseradïsh peroxidase

Mr :

relative molecular mass

PBS:

phosphatebuffered saline, pH 7.3

scFv:

single-chain Fv fragment

VH and VL :

variable domains of antibody heavy and light chains, respectively

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Kortt, A.A., Guthrie, R.E., Hinds, M.G. et al. Solution properties ofEscherichia coli-expressed VH domain of anti-neuraminidase antibody NC41. J Protein Chem 14, 167–178 (1995). https://doi.org/10.1007/BF01980329

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  • DOI: https://doi.org/10.1007/BF01980329

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