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  • Cyclic 2,3-diphosphoglycerate  (3)
  • Activation  (1)
  • Cyclic 2,3-diphosphoglycerate synthetase  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Cyclic 2,3-diphosphoglycerate metabolism in Methanobacterium thermoautotrophicum (strain ΔH): characterization of the synthetase reaction (1994)
    Springer
    Archives of microbiology 162 (1994), S. 193-198 
    Details
    ISSN: 1432-072X
    Keywords: Methanobacterium thermoautotrophicum ; Cyclic 2,3-diphosphoglycerate ; 2,3-Diphosphoglycerate ; Cyclic 2,3-diphosphoglycerate synthetase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The levels of cyclic 2,3-diphosphoglycerate (cDPG) in methanogenic bacteria are governed by the antagonistic activities of cDPG synthetase and cDPG hydrolase. In this paper we focus on the synthetase from Methanobacterium thermoautotrophicum. The cytoplasmic 150 kDa enzyme catalyzed cDPG synthesis from 2,3-diphosphoglycerate (apparent Km=21 mM), Mg2+ (Km=3.1 mM) and ATP (Km=1–2 mM). In batch-fed cultures, the enzyme was constitutively present (6–6.5 nmol per min per mg protein) during the different growth phases. In continuous cultures, activity decreased in response to phosphate limitation. The synthetase reaction proceeded with maximal rate at pH 6 and at 65° C and was specifically dependent on high (〉0.3M) K+ concentrations. The reaction conditions remarkably contrasted to those of cDPG degradation catalyzed by the previously described membrane-bound cDPG hydrolase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00314474
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Methanobacterium thermoautotrophicum (strain ΔH) contains a membrane-bound cyclic 2,3-diphosphoglycerate hydrolase (1994)
    Springer
    Archives of microbiology 161 (1994), S. 514-520 
    Details
    ISSN: 1432-072X
    Keywords: Methanobacterium thermoautotrophicum ; Cyclic 2,3-diphosphoglycerate ; 2,3-Diphosphoglycerate ; Cyclic 2,3-diphosphoglycerate hydrolase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cyclic 2,3-diphosphoglycerate (cDPG) hydrolase activity was demonstrated in cofactor-free extract of Methanobacterium thermoautotrophicum (strain ΔH), but not in crude extract. Only after ultrafiltration or dialysis of crude extract cDPG hydrolase activity could be shown. cCPG hydrolysis was optimal at pH 6.0 and 60°C. Hydrolysis of cDPG occurred under nitrogen or hydrogen atmosphere and was completely inhibited by oxygen. Phosphate and potassium chloride were also strong inhibitors: 50% inhibition occurred at 0.6–0.7 mM phosphate or 0.2 M KCl. The enzyme was localized in the membrane fraction and could be solubilized for approximately 60% by treatment with 25 mM of the detergent CHAPS. The K m and the V max for cDPG were determined at 60°C and were 59 mM and 216 mU/mg, respectively. Furthermore, cDPG hydrolase was dependent on the presence of Co2+. The role of cDPG and cDPG hydrolase is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307773
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  • 3
    Electronic Resource
    Electronic Resource
    Reductive activation of the methyl-tetrahydromethanopterin: coenzyme M methyltransferase from Methanobacterium thermoautotrophicum strain ΔH (1988)
    Springer
    Archives of microbiology 150 (1988), S. 405-412 
    Details
    ISSN: 1432-072X
    Keywords: Methanobacterium thermoautotrophicum ; Activation ; Corrinoid enzyme ; Methyltransferase ; Methanopterin ; Coenzyme M
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The enzymatic conversion of formaldehyde to CH3S-CoM in crude extracts of Methanobacterium thermoautotrophicum was used as a means to investigate the methyl-tetrahydromethanopterin: HS-CoM methyltransferase reaction. All components necessary for formaldehyde conversion were shown to be present in a soluble protein fraction. This soluble cell fraction still contained a major amount of corrinoids. Apart from tetrahydromethanopterin no other soluble cofactors were required for formaldehyde conversion. The dependence of the system on catalytic amounts of ATP was shown to be specific. Several nucleoside triphosphates or ADP were unable to substitute for ATP. Remarkably, various strong reducing systems, especially titanium(III)citrate could replace ATP to a large extent. The ATP-dependent formaldehyde conversion to CH3S-CoM was inhibited in the presence of nitrous oxide, detergents or 2′,3′-dialdehyde-ATP. The results support a role for a corrinoid protein in the methyl-tetrahydromethanopterin: HS-CoM methyltransferase reaction at which ATP is involved in the activation of this protein, probably in the conversion of inactive B12a or B12r to active B12s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408315
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  • 4
    Electronic Resource
    Electronic Resource
    ATP synthesis from 2,3-diphosphoglycerate by cell-free extract of Methanobacterium thermoautotrophicum (strain ΔH) (1991)
    Springer
    Archives of microbiology 156 (1991), S. 491-496 
    Details
    ISSN: 1432-072X
    Keywords: Methanogenic bacteria ; Methanobacterium thermoautotrophicum ; ATP synthesis ; 2,3-Diphosphoglycerate ; 2,3-Diphosphoglycerate phosphatase ; Cyclic 2,3-diphosphoglycerate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Cell-free extracts of Methanobacterium thermoautotrophicum were found to catalyze ATP synthesis from an endogeneous substrate. Synthesis was stimulated under hydrogen atmosphere and inhibited by KCL (K i =150 mM). Comparison of the properties of a number of cell constituents showed the endogeneous substrate to be 2,3-diphosphoglycerate. The compound is converted into 3-phosphoglycerate, and via 2-phosphoglycerate and phosphoenolpyruvate into pyruvate, at which the latter reaction is linked with ATP synthesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00245397
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    Paper (German National Licenses)
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