pubmed.ncbi.nlm.nih.gov

Evolution of the first metabolic cycles - PubMed

Evolution of the first metabolic cycles

G Wächtershäuser. Proc Natl Acad Sci U S A. 1990 Jan.

Abstract

There are two alternatives concerning the origin of life: the origin may be heterotrophic or autotrophic. The central problem within the theory of an autotrophic origin is the first process of carbon fixation. I here propose the hypothesis that this process is an autocatalytic cycle that can be retrodictively constructed from the extant reductive citric acid cycle by replacing thioesters by thioacids and by assuming that the required reducing power is obtained from the oxidative formation of pyrite (FeS2). This archaic cycle is strictly chemoautotrophic: photoautotrophy is not required. The cycle is catalytic for pyrite formation and autocatalytic for its own multiplication. It is a consequence of this hypothesis that the postulated cycle cannot exist as a single isolated cycle but must be a member of a network of concatenated homologous cycles, from which all anabolic pathways appear to have sprung.

PubMed Disclaimer

Similar articles

Cited by

References

    1. Annu Rev Microbiol. 1976;30:409-25 - PubMed
    1. Proc Natl Acad Sci U S A. 1966 Apr;55(4):928-34 - PubMed
    1. J Theor Biol. 1974 Mar;44(1):145-60 - PubMed
    1. Arch Biochem Biophys. 1989 May 1;270(2):691-7 - PubMed
    1. Microbiol Rev. 1987 Jun;51(2):221-71 - PubMed

MeSH terms

LinkOut - more resources