Details of mannitol transport in Escherichia coli elucidated by site-specific mutagenesis and complementation of phosphorylation site mutants of the phosphoenolpyruvate-dependent mannitol-specific phosphotransferase system.

Abstract:

:The mannitol transport protein (EIImtl) carries out translocation with concomitant phosphorylation of mannitol from the periplasm to the cytoplasm, at the expense of phosphoenolpyruvate (PEP). The phosphoryl group which is needed for this group translocation is sequentially transferred from PEP via two phosphorylation sites, located exclusively on the C-terminal cytoplasmic domain, to mannitol. Oligonucleotide-directed mutagenesis was used to investigate the precise role of these sites in phosphoryl group transfer, by producing specific amino acid substitutions. The first phosphorylation site, His-554 (P1), was replaced by Ala, which renders the EII-H554A completely inactive in PEP-dependent mannitol phosphorylation, but not in mannitol/mannitol 1-phosphate exchange. The P2 site mutant, EII-C384S, was inactive both in the mannitol phosphorylation reaction and in the exchange reaction, due to replacement of the essential Cys-384 by Ser. Although EII-H554A and EII-C384S were both catalytically inactive in the PEP-dependent phosphorylation, EII-C384S was able to restore up to 55% of the wild-type mannitol phosphorylation activity with the EII-H554A mutant, indicating a direct phosphotransfer between two subunits. These phosphorylation data together with the data obtained from mannitol/mannitol phosphate exchange kinetics, after mixing EII-H554A and EII-C384S, indicated the formation of functionally stable heterodimers, which consist of an EII-H554A and an EII-C384S monomer.

journal_name

Biochemistry

journal_title

Biochemistry

authors

van Weeghel RP,van der Hoek YY,Pas HH,Elferink M,Keck W,Robillard GT

doi

10.1021/bi00221a006

subject

Has Abstract

pub_date

1991-02-19 00:00:00

pages

1768-73

issue

7

eissn

0006-2960

issn

1520-4995

journal_volume

30

pub_type

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