Utilization of l-alanine as carbon and nitrogen source by Deusulfovibrio HL21 |
| |
Authors: | Alfons J M Stams Leo G Hoekstra Theo A Hansen |
| |
Institution: | (1) Department of Microbiology, University of Groningen, Kerklaan 30, NL-9751 NN Haren, The Netherlands |
| |
Abstract: | Desulfovibrio HL21 is unable to grow with amino acids as energy substrates. Alanine, serine, aspartate and to some extent glutamate were used as carbon and nitrogen sources in the presence of hydrogen as the energy substrate. Dense cell suspensions converted alanine stoichiometrically to acetate, NH
4
+
and presumably HCO
3
-
, but at a very low rate.
Desulfovibrio HL21 cells grown with alanine as carbon and nitrogen source contained increased levels of NAD(P)-dependent l-alanine dehydrogenase as compared to cells grown with NH4Cl as nitrogen source. Unfavourable kinetic properties of this alanine dehydrogenase, repression of the synthesis of the enzyme by NH
4
+
and a low rate of NADH oxidation all have a negative effect on the rate of degradation of alanine and may partly explain the inability of the strain to grow with alanine as an energy substrate. |
| |
Keywords: | Desulfovibrio Alanine degradation |
本文献已被 SpringerLink 等数据库收录! |
|