Characterization of the lactose transport system in Citrobacter freundii.

Abstract:

:The lactose transport system of Citrobacter freundii was characterized. Both the lactose transport system and beta-galactosidase were induced with either lactose or isopropyl-beta-D-thiogalactopyranoside (IPTG), the latter being the better inducer. The Km values for methyl-beta-D-thiogalactopyranoside (TMG) transport and lactose transport were 0.61 mM and 1.1 mM, respectively, and the Vmax values were 53 nmol/min/mg cell protein and 12 nmol/min/mg cell protein, respectively. Thus, TMG is a better substrate than lactose. Thiogalactopyranoside (TDG) was a very potent competitive inhibitor. Neither Na+ nor Li+ had a significant effect on the TMG transport or the lactose transport. Proton/substrate cotransport (symport) via this system was observed.

journal_name

Biol Pharm Bull

authors

Okazaki N,Tsuda M,Wilson TH,Tsuchiya T

doi

10.1248/bpb.17.794

subject

Has Abstract

pub_date

1994-06-01 00:00:00

pages

794-7

issue

6

eissn

0918-6158

issn

1347-5215

journal_volume

17

pub_type

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