Changes in membrane lipids and amino acid transport in a nystatin-resistant Aspergillus niger

1990 ◽  
Vol 36 (6) ◽  
pp. 435-437 ◽  
Author(s):  
Chitra Mazumder ◽  
Joyoti Basu ◽  
Manikuntala Kundu ◽  
Parul Chakrabarti
Keyword(s):  
Amino Acid ◽  
Aspergillus Niger ◽  
Glutamic Acid ◽  
Amino Acid Transport ◽  
Membrane Lipids ◽  
Phospholipid Composition ◽  
Resistant Mutant ◽  
Acid Transport ◽  
Quantitative Changes ◽  
Key Words Aspergillus

A nystatin-resistant mutant of Aspergillus niger is described that has quantitative changes in phospholipid composition compared with the wild type. The proportion of linoleic acid in total phospholipids was elevated in the mutant from 38 to 56% and the proportion of oleic acid was lowered from 28 to 12%. Amino acid transport is also altered, the Vmax values for the uptake of leucine, lysine, and glutamic acid being generally higher in the mutant; for glutamic acid the increase was from 15 to 35 nmol∙mg−1∙min−1. Key words: Aspergillus niger, nystatin resistance, phospholipid composition, amino acid transport.

Lipid composition and amino acid transport in a nystatin-resistant mutant ofAspergillus niger

Lipids ◽  
1987 ◽  
Vol 22 (9) ◽  
pp. 609-612 ◽  
Author(s):  
Chitra Mazumder ◽  
Manikuntala Kundu ◽  
Joyoti Basu ◽  
Parul Chakrabarti
Keyword(s):  
Amino Acid ◽  
Lipid Composition ◽  
Amino Acid Transport ◽  
Resistant Mutant ◽  
Acid Transport ◽  
Mutant Ofaspergillus

Echinococcus granulosus: specificity of amino acid transport systems in protoscoleces

Parasitology ◽  
1987 ◽  
Vol 95 (1) ◽  
pp. 71-78 ◽  
Author(s):  
S. A. Jeffs ◽  
C. Arme
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Glutamic Acid ◽  
Echinococcus Granulosus ◽  
Concentration Gradient ◽  
Amino Acid Transport ◽  
Transport Systems ◽  
Acid Transport ◽  
Transport And Diffusion ◽  
And Diffusion

SUMMARYProtoscoleces ofEchinococcus granulosusabsorb the l-amino acids proline, methionine, leucine, alanine, serine, phenylalanine, lysine and glutamic acid by a combination of mediated transport and diffusion. All eight amino acids were accumulated against a concentration gradient. Comparison ofKtandVmaxvalues suggests that a low affinity for a particular compound is compensated for by a relatively larger number of transport sites for that compound. Four systems serve for the transport of the eight substrates studied: 2 for neutral (EgNl, EgN2) and 1 each for acidic (EgA) and basic (EgB) amino acids. All eight amino acids are incorporated into protein to varying degrees and substantial portions of absorbed l-alanine and l-methionine are metabolized into other compounds.

AMINO ACID TRANSPORT SYSTEMS IN BRUSH-BORDER MEMBRANE VESICLES FROM LEPIDOPTERAN ENTEROCYTES

1989 ◽  
Vol 143 (1) ◽  
pp. 87-100
Author(s):  
GIORGIO M. HANOZET ◽  
BARBARA GIORDANA ◽  
V. FRANCA SACCHI ◽  
PAOLO PARENTI
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Glutamic Acid ◽  
Brush Border ◽  
Amino Acid Transport ◽  
Brush Border Membrane ◽  
Membrane Vesicles ◽  
Transport Systems ◽  
Acid Transport ◽  
Luminal Membrane

The presence of different potassium-dependent amino acid transport systems in the luminal membrane of the larval midgut of Philosamia cynthia Drury (Saturnidae, Lepidoptera) was investigated by means of countertransport experiments performed with brush-border membrane vesicles. The vesicles were preloaded with 14 different unlabelled amino acids, whose ability to elicit an intravesicular accumulation over the equilibrium value of six labelled amino acids (L-alanine, L-leucine, L-phenylalanine, L-glutamic acid, L-lysine and L-histidine) was tested. For histidine, the results were compared with those obtained from inhibition experiments, in which the same 14 amino acids were used as inhibitors on the cis side of the brush-border membrane. The data demonstrate the presence in the lepidopteran luminal membrane of distinct transport pathways for lysine and glutamic acid. The transport of most neutral amino acids, with the exclusionof glycine and proline, seems to occur through a system that may be similar to the neutral brush-border system (NBB) found in mammalian intestinal membranes. This system is also able to handle histidine.

Placental Amino Acid transport is decreased after exposure to hypoxia

2008 ◽  
Vol 68 (S 01) ◽  
Author(s):  
FM von Versen-Höynck ◽  
A Rajakumar ◽  
JM Roberts ◽  
W Rath ◽  
RW Powers
Keyword(s):  
Amino Acid ◽  
Amino Acid Transport ◽  
Acid Transport

scholarly journals Induction of amino acid transport in primary cultures of adult rat liver parenchymal cells by insulin.

1976 ◽  
Vol 251 (10) ◽  
pp. 3014-3020 ◽  
Author(s):  
R F Kletzien ◽  
M W Pariza ◽  
J E Becker ◽  
V R Potter ◽  
F R Butcher
Keyword(s):  
Amino Acid ◽  
Rat Liver ◽  
Amino Acid Transport ◽  
Primary Cultures ◽  
Acid Transport ◽  
Liver Parenchymal ◽  
Adult Rat ◽  
Parenchymal Cells
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