Histidine utilization by the unicellular alga Dunaliella tertiolecta
Research output: Contribution to journal › Article › peer-review
Standard
Histidine utilization by the unicellular alga Dunaliella tertiolecta. / Hellio, Claire; Le Gal, Y.
In: Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology, Vol. 119, No. 3, 1998, p. 753-758.Research output: Contribution to journal › Article › peer-review
Harvard
APA
Vancouver
Author
Bibtex
}
RIS
TY - JOUR
T1 - Histidine utilization by the unicellular alga Dunaliella tertiolecta
AU - Hellio, Claire
AU - Le Gal, Y.
PY - 1998
Y1 - 1998
N2 - The unicellular alga Dunaliella tertiolecta was cultivated axenically with histidine, or ammonium, or histidine and ammonium ions as nitrogen sources. In the presence of histidine as the sole source of nitrogen, cell growth is comparable to that observed with the same concentration of nitrogen in ammonium form. In the presence of both histidine and ammonium, histidine degradation is observed only when the concentration of ammonium falls below 4 mM. Under these conditions, the first two enzymes of histidine degradation pathway, histidase and urocanase, as well as histidine permease, are produced. Linear relationships are observed between histidase and urocanase and histidase and histidine permease, respectively, showing that, in D. tertiolecta enzyme, systems are coordinately regulated. Histidase activity is also controlled by succinate, glutamate and acetate as carbon sources. D. tertiolecta is unable to grow on a medium containing acetate and histidine together in the absence of ammonium.
AB - The unicellular alga Dunaliella tertiolecta was cultivated axenically with histidine, or ammonium, or histidine and ammonium ions as nitrogen sources. In the presence of histidine as the sole source of nitrogen, cell growth is comparable to that observed with the same concentration of nitrogen in ammonium form. In the presence of both histidine and ammonium, histidine degradation is observed only when the concentration of ammonium falls below 4 mM. Under these conditions, the first two enzymes of histidine degradation pathway, histidase and urocanase, as well as histidine permease, are produced. Linear relationships are observed between histidase and urocanase and histidase and histidine permease, respectively, showing that, in D. tertiolecta enzyme, systems are coordinately regulated. Histidase activity is also controlled by succinate, glutamate and acetate as carbon sources. D. tertiolecta is unable to grow on a medium containing acetate and histidine together in the absence of ammonium.
U2 - 10.1016/S1095-6433(98)01011-3
DO - 10.1016/S1095-6433(98)01011-3
M3 - Article
VL - 119
SP - 753
EP - 758
JO - Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology
JF - Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology
SN - 1095-6433
IS - 3
ER -
ID: 154579