Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Assembly of Kch, a putative potassium channel from Escherichia coli
KTH, School of Technology and Health (STH).
KTH, School of Technology and Health (STH), Structural Biotechnology (Closed 20130701).ORCID iD: 0000-0002-3220-9402
2009 (English)In: Journal of Structural Biology, ISSN 1047-8477, E-ISSN 1095-8657, Vol. 168, no 2, 288-293 p.Article in journal (Refereed) Published
Abstract [en]

Attempts to explore the structure and function of Kch, a putative potassium channel of Escherichia coli have yielded varying results; potassium-associated functions have been found in vivo but not in vitro. Here the kch gene is shown to produce two proteins, full-length Kch and the large C-terminal cytosolic domain (the RCK domain). Further, these two proteins are associated at the initial stages of purification. Previous structural studies of full-length Kch claim that the isolated protein forms large aggregates that are not suitable for analysis. The results presented here show that the purified protein sample, although heterogeneous, has one major population with a mass of about 400 kDa, implying the presence of two Kch tetramers in a complex form. A three dimensional reconstruction at 25 angstrom based on electron microscopy data from negatively stained particles, revealed a 210 angstrom long and 95 angstrom wide complex in which the two tetrameric Kch units are linked by their RCK domains, giving rise to a large central ring of density. The formation of this dimer of tetramers on expression or during purification, may explain why attempts to reconstitute Kch into liposomes for activity measurements have failed.

Place, publisher, year, edition, pages
2009. Vol. 168, no 2, 288-293 p.
Keyword [en]
Kch, RCK, Potassium channel, Membrane protein, Single particle, Negative stain, Electron microscopy, Mass measurement, STEM, rck domain, k+ channel, protein, homolog, ring
Identifiers
URN: urn:nbn:se:kth:diva-18874DOI: 10.1016/j.jsb.2009.07.018ISI: 000270865000008Scopus ID: 2-s2.0-70349451964OAI: oai:DiVA.org:kth-18874DiVA: diva2:336921
Note

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Authority records BETA

Hebert, Hans

Search in DiVA

By author/editor
Lundbäck, Anna-KarinHebert, Hans
By organisation
School of Technology and Health (STH)Structural Biotechnology (Closed 20130701)
In the same journal
Journal of Structural Biology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 50 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf