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. 1986 Aug;83(16):5789–5792. doi: 10.1073/pnas.83.16.5789

Immunocytochemical localization of component C of the methylreductase system in Methanococcus voltae and Methanobacterium thermoautotrophicum

R Ossmer *, T Mund *, P L Hartzell †, U Konheiser ‡, G W Kohring *, A Klein ‡, R S Wolfe †, G Gottschalk *, F Mayer *
PMCID: PMC386380  PMID: 16593743

Abstract

Antibodies were raised against homogeneous preparations of component C of the methylreductase system from Methanococcus voltae and Methanobacterium thermoautotrophicum. Cells of these organisms were fixed with paraformaldehyde and/or glutaraldehyde, sectioned, and labeled with antibodies and colloidal gold-labeled protein A. In M. voltae the gold particles were predominantly located in the vicinity of the cytoplasmic membrane. In rare cases a similar result was obtained also with M. thermoautotrophicum. However, in all but a few of the ultrathin sections of this bacterium, the label was randomly distributed in the cell interior. If one assumes a reliable fixation of all cell components, these results would suggest that the two distantly related methanogens studied have distinctive patterns for the localization of component C. The results with M. voltae are in agreement with recent findings that the methylreductase system is involved in the generation of a proton-motive force at the membrane.

Keywords: methanogen, methane, Archaeobacteria, nickel tetrapyrrole

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