The kinetics of glutamine transport in bovine lymphocytes (original) (raw)

Biochemistry international, 1992

Abstract

The transport of glutamine was examined in bovine peripheral lymphocytes which had been cultured in the presence or absence of Concanavalin A (Con A). Glutamine transport was mediated by a triphasic transport system in both cell populations. The calculated kinetic parameters were: Km 1.0, 4.7 and 12.7 mM and Vmax 4.5, 6.0 and 9.0 nmol/min per mg protein respectively. Con A augmented the capacity rather than the affinity of the glutamine transport systems (Vmax rates being 8.0, 12.2 and 38.0 nmol/min per mg protein respectively). Transporter I displayed Michaelis-Menton kinetics, while transporters II and III were co-operative carriers possessing Hill coefficients of 2.3 and 9.5 respectively. Preliminary studies using amino acid and ion inhibition studies suggested that transporter I was a system ASC-type carrier, transporter III a system L carrier, while the nature of transporter II was unclear.

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