Abstract:
:The discovery that all hyperthermophiles that have been evaluated have the capacity to reduce Fe(III) has raised the question of whether mechanisms for dissimilatory Fe(III) reduction have been conserved throughout microbial evolution. Many studies have suggested that c-type cytochromes are integral components in electron transport to Fe(III) in mesophilic dissimilatory Fe(III)-reducing microorganisms. However, Pyrobaculum islandicum, the hyperthermophile in which Fe(III) reduction has been most intensively studied, did not contain c-type cytochromes. NADPH was a better electron donor for the Fe(III) reductase activity in P. islandicum than NADH. This is the opposite of what has been observed with mesophiles. Thus, if previous models for dissimilatory Fe(III) reduction by mesophilic bacteria are correct, then it is unlikely that a single strategy for electron transport to Fe(III) is present in all dissimilatory Fe(III)-reducing microorganisms.
journal_name
FEMS Microbiol Lettjournal_title
FEMS microbiology lettersauthors
Childers SE,Lovley DRdoi
10.1111/j.1574-6968.2001.tb10529.xkeywords:
subject
Has Abstractpub_date
2001-02-20 00:00:00pages
253-8issue
2eissn
0378-1097issn
1574-6968pii
S0378-1097(01)00018-0journal_volume
195pub_type
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