PMID:9657392

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Citation

Voges, D and Jap, BK (1998) Recombinant expression, purification and characterization of Kch, a putative Escherichia coli potassium channel protein. FEBS Lett. 429:104-8

Abstract

The Escherichia coli gene kch, similar in primary structure to eukaryotic voltage-gated potassium channels, was cloned and overexpressed in E. coli. The protein was solubilized from the plasma membrane with dodecylmaltopyranoside, lauryldimethylamine oxide or N-laurylsarcosine and was purified in milligram amounts by imidazole elution from a nickel-chelate column. The molecular mass of the purified protein in a number of detergents with 12 carbon atom chains suggests that rKch forms primarily tetramers of the 50 kDa monomers. CD spectroscopy of the purified protein indicates a significant alpha-helical content that is preserved upon addition of SDS.

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Keywords

Bacterial Proteins/chemistry; Bacterial Proteins/genetics; Bacterial Proteins/isolation & purification; Escherichia coli/chemistry; Escherichia coli/genetics; Escherichia coli Proteins; Membrane Proteins/isolation & purification; Potassium Channels/chemistry; Potassium Channels/genetics; Potassium Channels/isolation & purification

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