Transcription initiation as a control point in plastid gene expression.

Autor: Puthiyaveetil S; Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN 47907, USA. Electronic address: spveetil@purdue.edu., McKenzie SD; Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN 47907, USA., Kayanja GE; Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN 47907, USA., Ibrahim IM; Department of Biochemistry and Center for Plant Biology, Purdue University, West Lafayette, IN 47907, USA.
Jazyk: angličtina
Zdroj: Biochimica et biophysica acta. Gene regulatory mechanisms [Biochim Biophys Acta Gene Regul Mech] 2021 Mar; Vol. 1864 (3), pp. 194689. Date of Electronic Publication: 2021 Feb 06.
DOI: 10.1016/j.bbagrm.2021.194689
Abstrakt: The extensive processing and protein-assisted stabilization of transcripts have been taken as evidence for a viewpoint that the control of gene expression had shifted entirely in evolution from transcriptional in the bacterial endosymbiont to posttranscriptional in the plastid. This suggestion is however at odds with many observations on plastid gene transcription. Chloroplasts of flowering plants and mosses contain two or more RNA polymerases with distinct promoter preference and division of labor for the coordinated synthesis of plastid RNAs. Plant and algal plastids further possess multiple nonredundant sigma factors that function as transcription initiation factors. The controlled accumulation of plastid sigma factors and modification of their activity by sigma-binding proteins and phosphorylation constitute additional transcriptional regulatory strategies. Plant and algal plastids also contain dedicated one- or two-component transcriptional regulators. Transcription initiation thus continues to form a critical control point at which varied developmental and environmental signals intersect with plastid gene expression.
(Copyright © 2021 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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