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B6db references: 28412355

type Journal Article
authors Park SA, Park YS, Lee KS
title Crystal structure of the C-terminal domain of Bacillus subtilis GabR reveals a closed conformation by γ-aminobutyric acid binding, inducing transcriptional activation
journal Biochem Biophys Res Commun
Activity mocr
sel selected
ui 28412355
year (2017)
volume 487
number 2
pages 287-291
 
keywords Aminotransferase-like domain; Bacillus subtilis GabR; External Schiff base; Transcriptional regulator; γ-Aminobutyric acid
abstract Bacillus subtilis GabR (BsGabR) is involved in the γ-aminobutyric acid (GABA) catabolism as a transcriptional regulator, consisting of an N-terminal helix-turn-helix DNA-binding domain and a C-terminal aminotransferase-like (AT-like) domain. Research on the C-terminal AT-like domain of BsGabR (BsGabR-CTD) has focused on the interaction with GABA as an effector, but most its functional details remain unclear. To understand the underlying mechanism, we report the crystal structure of BsGabR-CTD in complex with pyridoxal 5'-phosphate (PLP) and GABA at 2.0 resolution. The structure of ligand-bound BsGabR-CTD revealed two distinct monomeric states in a homodimer. One subunit is a closed-form containing the PLP-GABA adduct, and the other subunit is a PLP-bound open-form. Our structural studies provide a detailed mechanism indicating that the open-to-closed transition by the binding of GABA induces the conformational rearrangement of BsGabR-CTD, which may trigger the activation of transcription.
last changed 2017/10/26 14:44

B6db references