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2018 ; 8
(1
): 10124
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Mycobacterium tuberculosis CarD, an essential global transcriptional regulator
forms amyloid-like fibrils
#MMPMID29973616
Kaur G
; Kaundal S
; Kapoor S
; Grimes JM
; Huiskonen JT
; Thakur KG
Sci Rep
2018[Jul]; 8
(1
): 10124
PMID29973616
show ga
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 tendency to form amyloid-like fibrils both in vitro as well as in
vivo. We demonstrate that the deletion of the fourteen N-terminal residues
involved in domain-swapping hampers amyloid formation, thus, suggesting that
domain-swapping is crucial in amyloidogenesis. The discovery of the amyloidogenic
property of an essential cytosolic global transcription regulator, CarD, in a
pathogenic bacteria will further open up new frontiers in research.