The importance of amino acids as carbon sources for Micromonospora echinospora (ATCC 15837).
OBJECTIVE
This study set out to investigate the effect of amino acids on the uptake of glucose by Micromonospora eichinospora (ATCC 15837).


RESULTS
The specific rate of glucose uptake was found to be reduced when organic nitrogen components were present in the medium. Radioactive uptake studies revealed that the Km for glucose in this organism was 53 mm, indicating a low affinity for uptake compared with other actinomycete sugar transport systems. Individual amino acids negatively influenced the rate of glucose transport, suggesting a relationship between amino acid metabolism and glucose uptake in this organism. The sugar transport system was found to be an active process being inhibited by ionophores and KCN.


CONCLUSIONS
The data suggest a direct link between amino acid metabolism and glucose uptake at the level of sugar transport.


CONCLUSIONS
This study shows that the uptake of glucose, a major carbon source for many antibiotic fermentations, is significantly reduced in the presence of amino acids. This fact should inform the medium design and feeding regimes of fermentations involving similar actinomycetes.
Hoskisson
P A
PA
School of Biomolecular Sciences, Liverpool John Moores University, Liverpool, UK. paul.hoskisson@bbsrc.ac.uk
Sharples
G P
GP
Hobbs
G
G
D000596:Amino Acids / Q000378:metabolism*; D001216:Asparagine / Q000378:metabolism; D002244:Carbon / Q000378:metabolism; D015536:Down-Regulation; D005947:Glucose / Q000378:metabolism*; D008847:Micromonospora / Q000145:classification / Q000254:growth & development / Q000378:metabolism*
D000596:Amino Acids; D001216:Asparagine; D002244:Carbon; D005947:Glucose