title: 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 revealed by the extension of secondary structures in the holo-forms, and the overall rigidity shown by the backbone dynamics data. However, the 50 s loops of both proteins in the holo-form still show conformational exchanges on the µs-ms timescales, which appears to be a common feature in the flavodoxin family, and might play an important role in structural fine-tuning during the electron transfer reactions.
authors.affiliation: Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing, China; College of Life Sciences, Peking University, Beijing, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Ye
authors.affiliation: Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing, China; College of Chemistry and Molecular Engineering, Peking University, Beijing, China.
authors.forename: Yunfei
authors.initials: Y
authors.lastname: Hu
authors.affiliation: Beijing Nuclear Magnetic Resonance Center, Peking University, Beijing, China; College of Life Sciences, Peking University, Beijing, China; College of Chemistry and Molecular Engineering, Peking University, Beijing, China; Beijing National Laboratory for Molecular Sciences, Peking University, Beijing, China.
authors.forename: Changwen
authors.initials: C
authors.lastname: Jin
mesh_terms: D001059:Apoproteins / Q000737:chemistry / Q000378:metabolism; D001665:Binding Sites / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D029968:Escherichia coli Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D005486:Flavin Mononucleotide / Q000378:metabolism; D005418:Flavodoxin / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D008958:Models, Molecular; D011485:Protein Binding; D011487:Protein Conformation; D017510:Protein Folding
chemical_list: D001059:Apoproteins; D029968:Escherichia coli Proteins; D005418:Flavodoxin; D005486:Flavin Mononucleotide
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