scholarly journals Effects of the deletion of hup genes encoding the uptake hydrogenase on the activity of hydrogen production in the purple photosynthetic bacterium Rubrivivax gelatinosus IL144

2017 ◽  
Vol 63 (5) ◽  
pp. 274-279 ◽  
Author(s):  
Takeshi Sato ◽  
Kazuhito Inoue ◽  
Hidehiro Sakurai ◽  
Kenji V. P. Nagashima
Keyword(s):  
Hydrogen Production ◽  
Photosynthetic Bacterium ◽  
Uptake Hydrogenase ◽  
Genes Encoding ◽  
Purple Photosynthetic Bacterium ◽  
Rubrivivax Gelatinosus

Organization of the Genes Encoding Uptake Hydrogenase in the Photosynthetic Bacterium Rhodobacter Capsulatus

1991 ◽  
pp. 503-508
Author(s):  
A. Colbeau ◽  
P. Richaud ◽  
J. P. Magnin ◽  
J. Caballero ◽  
B. Cauvin ◽  
...  
Keyword(s):  
Rhodobacter Capsulatus ◽  
Photosynthetic Bacterium ◽  
Uptake Hydrogenase ◽  
Genes Encoding

Bioenergetics of lactate vs. acetate outside TCA enhanced the hydrogen evolution levels in two newly isolated strains of the photosynthetic bacterium Rhodopseudomonas

2017 ◽  
Vol 72 (3-4) ◽  
pp. 99-105
Author(s):  
Amal W. Danial ◽  
Ahmed M. Abdel Wahab ◽  
Houssam H. Arafat ◽  
Refat Abdel-Basset
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Evolution ◽  
Immobilized Cells ◽  
Nitrogenase Activity ◽  
Photosynthetic Bacterium ◽  
Free Cell ◽  
Dairy Wastewater ◽  
Purple Nonsulfur Bacteria ◽  
Uptake Hydrogenase ◽  
Production Growth

Abstract Two local hydrogen-evolving strains of purple nonsulfur bacteria have been isolated, characterized, and identified as Rhodopseudomonas sp. TUT (strains Rh1 and Rh2). Lactate followed by succinate and malate supported the highest amounts of H2 production, growth (O.D.660nm, proteins and bacteriochlorphyll contents), nitrogenase activity, and uptake hydrogenase; the least of which was acetate. Alginate-immobilized cells evolved higher hydrogen amounts than free cell counterparts. Rh1 was more productive than Rh2 at all circumstances. Lactate-dependent hydrogen evolution was more than twice that of acetate, due to ATP productivity (2/–1, respectively), which is limiting to the nitrogenase activity. The preference of lactate over other acids indicates the feasibility of using these two strains in hydrogen production from dairy wastewater.

scholarly journals Phytoene Desaturase, CrtI, of the Purple Photosynthetic Bacterium, Rubrivivax gelatinosus, Produces both Neurosporene and Lycopene

2001 ◽  
Vol 42 (10) ◽  
pp. 1112-1118 ◽  
Author(s):  
Jiro Harada ◽  
Kenji V. P. Nagashima ◽  
Shinichi Takaichi ◽  
Norihiko Misawa ◽  
Katsumi Matsuura ◽  
...  
Keyword(s):  
Photosynthetic Bacterium ◽  
Phytoene Desaturase ◽  
Purple Photosynthetic Bacterium ◽  
Rubrivivax Gelatinosus

Reduction of the oxidized bacteriochlorophyll dimer in reaction centers by ferrocene is dependent upon the driving force

2007 ◽  
Vol 11 (03) ◽  
pp. 205-211 ◽  
Author(s):  
László Kálmán ◽  
Arlene L. M. Haffa ◽  
JoAnn C. Williams ◽  
Neal W. Woodbury ◽  
James P. Allen
Keyword(s):  
Electron Transfer ◽  
Rate Constants ◽  
Ph Dependence ◽  
Photosynthetic Bacterium ◽  
Energy Difference ◽  
Reaction Centers ◽  
Free Energy Difference ◽  
Midpoint Potential ◽  
Bacteriochlorophyll Dimer ◽  
Purple Photosynthetic Bacterium

The rates of electron transfer from ferrocene to the oxidized bacteriochlorophyll dimer, P , in reaction centers from the purple photosynthetic bacterium Rhodobacter sphaeroides, were measured for a series of mutants in which the P / P + midpoint potentials range from 410 to 765 mV (Lin et al. Proc. Natl. Acad. Sci. USA 1994; 91: 10265-10269). The observed rate constant for each mutant was found to be linearly dependent upon the ferrocene concentration up to 50 μM. The electron transfer is described as a second order reaction with rate constants increasing from 1.5 to 35 × 106 M -1. s -1 with increasing P / P + midpoint potential. This dependence was tested for three additional mutants, each of which exhibits a pH dependence of the P / P + midpoint potential due to an electrostatic interaction with an introduced carboxylic group (Williams et al. Biochemistry 2001; 40: 15403-15407). For these mutants, the pH dependence of the bimolecular rate constants followed a sigmoidal pattern that could be described with a Henderson-Hasselbalch equation, attributable to the change of the free energy difference for the reaction due to deprotonation of the introduced carboxylic side chains.

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