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J. Bacteriol., 05 1995, 2442-2450, Vol 177, No. 9
H Toyama, A Fujii, K Matsushita, E Shinagawa, M Ameyama and O Adachi
A bacterial strain that can utilize several kinds of alcohols as its sole
carbon and energy sources was isolated from soil and tentatively identified
as Pseudomonas putida HK5. Three distinct dye-linked alcohol dehydrogenases
(ADHs), each of which contained the prosthetic group pyrroloquinoline
quinone (PQQ), were formed in the soluble fractions of this strain grown on
different alcohols. ADH I was formed most abundantly in the cells grown on
ethanol and was similar to the quinoprotein ADH reported for P. putida (H.
Gorisch and M. Rupp, Antonie Leeuwenhoek 56:35-45, 1989) except for its
isoelectric point. The other two ADHs, ADH IIB and ADH IIG, were formed
separately in the cells grown on 1-butanol and 1,2-propanediol,
respectively. Both of these enzymes contained heme c in addition to PQQ and
functioned as quinohemoprotein dehydrogenases. Potassium ferricyanide was
an available electron acceptor for ADHs IIB and IIG but not for ADH I. The
molecular weights were estimated to be 69,000 for ADH IIB and 72,000 for
ADH IIG, and both enzymes were shown to be monomers. Antibodies raised
against each of the purified ADHs could distinguish the ADHs from one
another. Immunoblot analysis showed that ADH I was detected in cells grown
on each alcohol tested, but ethanol was the most effective inducer. ADH IIB
was formed in the cells grown on alcohols of medium chain length and also
on 1,3-butanediol. Induction of ADH IIG was restricted to 1,2-propanediol
or glycerol, of which the former alcohol was more effective. These results
from immunoblot analysis correlated well with the substrate specificities
of the respective enzymes.(ABSTRACT TRUNCATED AT 250 WORDS)
Copyright © 1995, American Society for Microbiology
Three distinct quinoprotein alcohol dehydrogenases are expressed when Pseudomonas putida is grown on different alcohols
Department of Biological Chemistry, Faculty of Agriculture, Yamaguchi University, Japan.
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