Conformational dynamics of Escherichia coli flavodoxins in apo- and holo-states by solution NMR spectroscopy.

ABSTRACT: Flavodoxins are a family of small FMN-binding proteins that commonly exist in prokaryotes. They utilize a non-covalently bound FMN molecule to act as the redox center during the electron transfer processes in various important biological pathways. Although extensive investigations were performed, detailed molecular mechanisms of cofactor binding and electron transfer remain elusive. Herein we report the solution NMR studies on Escherichia coli flavodoxins FldA and YqcA, belonging to the long-chain and short-chain flavodoxin subfamilies respectively. Our structural studies demonstrate that both proteins show the typical flavodoxin fold, with extensive conformational exchanges observed near the FMN binding pocket in their apo-forms. Cofactor binding significantly stabilizes both proteins as

SUBMITTER: Ye Q 

PROVIDER: S-EPMC4122359 | biostudies-literature | 2014

REPOSITORIES: biostudies-literature