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The respiratory system of Sulfolobus acidocaldarius , a thermoacidophilic archaebacterium
Author(s) -
Anemüller S.,
Lübben M.,
Schäfer G.
Publication year - 1985
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(85)80084-3
Subject(s) - sulfolobus acidocaldarius , thermoplasma acidophilum , biochemistry , sulfolobus , biology , electron transport chain , stereochemistry , chemistry , biophysics , archaea , enzyme , gene
The respiratory properties, cellular ATP content and absorption difference spectra of Sulfolobus acidocaldarius (DSM 639) have been investigated. In contrast to earlier postulates regarding Thermoplasma acidophilum [(1984) Syst. Appl. Microbiol. 5, 30‐40], S. acidocaldarius seemed to depend energetically on respiration‐coupled phosphorylation. Its ATP content strictly depended on respiratory activity. Its membrane is capable of proton pumping and presumably contains a branched electron transport system. The latter is composed of at least 2 types of cytochromes, an a+ ‐ and presumably an o ‐type, while c ‐type cytochromes could not be detected. It appears possible that one of the terminal oxidases is directly reduced by the socalled caldariellaquinone, found in the same organism [(1983) Syst. Appl. Microbiol. 4, 295‐304].