Mycobacterium tuberculosis CarD, an essential global transcriptional regulator forms amyloid-like fibrils.

ABSTRACT: CarD is an essential global transcription regulator from Mycobacterium tuberculosis (Mtb) that binds RNA polymerase and activates transcription by stabilizing the transcription initiation complex. Available crystal structures have captured two distinct, monomeric and domain-swapped homodimeric, oligomeric states of CarD. However, the actual oligomeric state of CarD in solution and its biological relevance has remained unclear. Here, we confirm the presence of the homodimeric state of CarD in solution by using synchrotron-based small-angle X-ray scattering. Furthermore, by using biochemical and biophysical experiments, in addition to mass-spectrometry, transmission electron microscopy, and confocal imaging, we show that CarD is the first soluble cytosolic protein in Mtb which displays the t

SUBMITTER: Kaur G 

PROVIDER: S-EPMC6031611 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature