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Cell, Vol. 29. l-2, May 1982, Copyright 0 1982 by MIT Molecular Genetics of
 

Summary: Cell, Vol. 29. l-2, May 1982, Copyright 0 1982 by MIT
Molecular Genetics of
Symbiotic Nitrogen Fixation
Frederick M. Ausubel
Department of Cellular and Developmental Biology
The Biological Laboratories
Harvard University
16 Divinity Avenue
Cambridge, Massachusetts 02138
Although most organisms, including all eucaryotes,
cannot assimilate atmospheric dinitrogen (N2), a group
of evolutionarily divergent procaryotes are able to
reduce N2 directly to ammonia (nitrogen fixation) un-
der a variety of physiological conditions. The molec-
ular genetics of nitrogen fixation has been studied
primarily in Klebsiella pneumoniae because of its
close taxonomic relation to Escherichia coli. K. pneu-
moniae contains a cluster of 17 contiguous nifgenes,
which are all transcribed in the same direction and
which are divided into seven or eight operons. Three

  

Source: Ausubel, Frederick M. - Department of Genetics, Harvard University

 

Collections: Biology and Medicine