Dimerization facilitates the conformational transitions for bacterial phosphotransferase enzyme I autophosphorylation in an allosteric manner.

Abstract:

:The bacterial phosphotransferase system is central to sugar uptake and phosphorylation. Enzyme I (EI), the first enzyme of the system, autophosphorylates as a dimer using phosphoenolpyruvate (PEP), but it is not clearly understood how dimerization activates the enzyme activity. Here, we show that EI dimerization is important for proper conformational transitions and the domain association required for the autophosphorylation. EI(G356S) with reduced dimerization affinity and lower autophosphorylation activity revealed that significantly hindered conformational transitions are required for the phosphoryl transfer reaction. The G356S mutation does not change the binding affinity for PEP, but perturbs the domain association accompanying large interdomain motions that bring the active site His189 close to PEP. The interface for the domain association is separate from the dimerization interface, demonstrating that dimerization can prime the conformational change in an allosteric manner.

journal_name

FEBS Open Bio

journal_title

FEBS open bio

authors

Lee KO,Yun YJ,Kim I,Suh JY

doi

10.1002/2211-5463.12260

subject

Has Abstract

pub_date

2017-07-17 00:00:00

pages

1208-1216

issue

8

issn

2211-5463

pii

FEB412260

journal_volume

7

pub_type

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