当前位置： SCI文献检索 > FEMS YEAST RESEARCH期刊下所有文献 > Characterisation of glucose transport in Saccharomyces cerevisiae with plasma membrane vesicles (countertransport) and intact cells (initial uptake) with single Hxt1, Hxt2, Hxt3, Hxt4, Hxt6, Hxt7 or Gal2 transporters.

Characterisation of glucose transport in Saccharomyces cerevisiae with plasma membrane vesicles (countertransport) and intact cells (initial uptake) with single Hxt1, Hxt2, Hxt3, Hxt4, Hxt6, Hxt7 or Gal2 transporters.

Abstract：

:The yeast glucose transporters Hxt1, Hxt2, Hxt3, Hxt4, Hxt6, Hxt7 and Gal2, individually expressed in an hxt1-7 null mutant strain, demonstrate the phenomenon of countertransport. Thus, these transporters, which are the most important glucose transporters in Saccharomyces cerevisiae, are facilitated diffusion transporters. Apparent K(m)-values from high to low affinity, determined from countertransport and initial-uptake experiments, respectively, are: Hxt6 0.9+/-0.2 and 1.4+/-0.1 mM, Hxt7 1.3+/-0.3 and 1.9+/-0.1 mM, Gal2 1.5 and 1.6+/-0.1 mM, Hxt2 2.9+/-0.3 and 4.6+/-0.3 mM, Hxt4 6.2+/-0.5 and 6.2+/-0.3 mM, Hxt3 28.6+/-6.8 and 34.2+/-3.2 mM, and Hxt1 107+/-49 and 129+/-9 mM. From both independent methods, countertransport and initial uptake, the same range of apparent K(m)-values was obtained for each transporter. In contrast to that in human erythrocytes, the facilitated diffusion transport mechanism of glucose in yeast was symmetric. Besides facilitated diffusion there existed in all single glucose transport mutants, except for the HXT1 strain, significant first-order behaviour.

journal_name

FEMS Yeast Res

journal_title

FEMS yeast research

authors

Maier A,Völker B,Boles E,Fuhrmann GF

doi

10.1111/j.1567-1364.2002.tb00121.x

keywords:

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

539-50

issue

4

eissn

1567-1356

issn

1567-1364

pii

S156713560200140X

journal_volume

2

pub_type

杂志文章

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