Proline and glycine uptake by renal brushborder membrane vesicles.
AUTOR(ES)
McNamara, P D
RESUMO
Uptake of L-proline and glycine by rat renal brushborder membrane vesicles was seen to be osmotically sensitive, pH dependent,and occurred in the absence of proline and glycine metabolism. The uptake system for proline was Na+ gradient dependent, and exhibited a dual system for entry, Km1 = 0.067 mM and Km2 = 5.26 mM. The uptake of glycine was also Na+ gradient dependent, and exhibited a two Km system, Km1 = 0.22 mM and Km2 = 4.00 mM. Studies of proline and glycine interactions indicate a shared site which has a lower affinity and higher capacity for glycine than for proline. The high affinity glycine site and low affinity proline site do not appear to be shared.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=431526Documentos Relacionados
- Chloride ion transport into pig jejunal brush-border membrane vesicles.
- Mechanisms of zinc transport into pig small intestine brush-border membrane vesicles.
- Tobramycin uptake in Escherichia coli membrane vesicles.
- Human placental L-tyrosine transport: a comparison of brush-border and basal membrane vesicles.
- Calcium uptake by intestinal brush border membrane vesicles. Comparison with in vivo calcium transport.