The separate roles of PQQ and apo-enzyme syntheses in the regulation of glucose dehydrogenase activity in Klebsiella pneumoniae NCTC 418 |
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Authors: | R W J Hommes P T D Herman P W Postma D W Tempest O M Neijssel |
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Institution: | (1) Department of Microbiology, Biotechnology Centre, University of Amsterdam, P.O. Box 20245, 1000 HE Amsterdam, The Netherlands;(2) Department of Biochemistry Biotechnology Centre, University of Amsterdam, Amsterdam, The Netherlands;(3) Department of Microbiology, University of Sheffield, S10 2TN Sheffield, UK;(4) Present address: Gist-brocades NV, P.O. Box 1, 2600 MA Delft, The Netherlands |
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Abstract: | No holoenzyme pyrroloquinoline quinone (PQQ)-dependent glucose dehydrogenase and only very low apoenzyme levels could be detected in cells of Klebsiella pneumoniae, growing anaerobically, or carrying out a fumarate or nitrate respiration. Low glucose dehydrogenase activity in some aerobic glucose-excess cultures of K. pneumoniae (ammonia or sulphate limitation) was increased significantly by addition of PQQ, whereas in cells already possessing a high glucose dehydrogenase activity (phosphate or potassium limitation) extra PQQ had almost no effect. These observations indicate that the glucose dehydrogenase activity in K. pneumoniae is modulated by both PQQ synthesis and synthesis of the glucose dehydrogenase apo-enzyme.Abbreviations PQQ
2, 7, 9-tricarboxy-1H-pyrrolo-(2,3-f)quinoline-4,5-dione
- WB
Wurster's Blue (1,4-bis-(dimethylamino)-benzene perchlorate) |
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Keywords: | Klebsiella pneumoniae Glucose dehydrogenase Pyrroloquinoline quinone Enzyme regulation Anaerobiosis Chemostat culture |
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