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A dual RNA regulator balancing carbon uptake and 1 central metabolism in Vibrio cholerae

ABSTRACT: Bacterial small RNAs (sRNAs) are well-known to modulate gene expression by base-pairing with trans-coded transcripts and are typically considered to be non-coding. However, several sRNAs have been reported to also contain an open reading frame and thus are considered dual regulators. In this study, we discovered a dual regulator from Vibrio cholerae, called VcdRP, harboring a 29 amino acid protein (VcdP), as well as a base-pairing sequence. Using a forward genetic screen, we identified VcdRP as a repressor of cholera toxin production and we link this phenotype to inhibition of carbon transport by the base-pairing segment of the regulator. By contrast, we demonstrate that VcdP acts downstream of carbon transport by binding to citrate synthase (GltA), the first enzyme of the citric cycle. Interaction of VcdP with GltA results in increased enzyme activity and together VcdR and VcdP reroute carbon metabolism. We further show that transcription of vcdRP is repressed by CRP allowing us to provide a model in which VcdRP employs two different molecular mechanisms to synchronize sugar uptake and metabolism in V. cholerae.

INSTRUMENT(S): Q Exactive Plus

ORGANISM(S): Vibrio Cholerae Serotype O1 (strain Atcc 39315 / El Tor Inaba N16961)

SUBMITTER: Andreas Tholey

LAB HEAD: Prof. Dr.Andreas Tholey

PROVIDER: PXD025275 | Pride | 2021-07-22

REPOSITORIES: Pride

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			Action	DRS
	Blank_KV01_1_200416194801.raw	Raw
	Blank_KV01_2_200416205020.raw	Raw
	Blank_KV04_1_200417064116.raw	Raw
	Blank_KV04_2_200417074336.raw	Raw
	KV_01_Ctrl_1.pdResult	Other

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Dual RNA regulator VcdRP in V. cholerae modulates central metabolism

Project description:Bacterial small RNAs (sRNAs) are well-known to modulate gene expression by base-pairing with trans-coded transcripts and are typically considered to be non-coding. However, several sRNAs have been reported to also contain an open reading frame and thus are considered dual-function regulators. We discovered a dual-function regulator from Vibrio cholerae, called VcdRP, harboring a 29 amino acid protein (VcdP), as well as a base-pairing sequence. In this study, we measured the metabolite abundance of glycolytic and citric acid cycle intermediates using LC-MS.

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