Transcriptional and chromatin-based partitioning mechanisms uncouple protein scaling from cell size.
Mol Cell
; 81(23): 4861-4875.e7, 2021 12 02.
Article
em En
| MEDLINE
| ID: mdl-34731644
ABSTRACT
Biosynthesis scales with cell size such that protein concentrations generally remain constant as cells grow. As an exception, synthesis of the cell-cycle inhibitor Whi5 "sub-scales" with cell size so that its concentration is lower in larger cells to promote cell-cycle entry. Here, we find that transcriptional control uncouples Whi5 synthesis from cell size, and we identify histones as the major class of sub-scaling transcripts besides WHI5 by screening for similar genes. Histone synthesis is thereby matched to genome content rather than cell size. Such sub-scaling proteins are challenged by asymmetric cell division because proteins are typically partitioned in proportion to newborn cell volume. To avoid this fate, Whi5 uses chromatin-binding to partition similar protein amounts to each newborn cell regardless of cell size. Disrupting both Whi5 synthesis and chromatin-based partitioning weakens G1 size control. Thus, specific transcriptional and partitioning mechanisms determine protein sub-scaling to control cell size.
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MEDLINE
Assunto principal:
Saccharomyces cerevisiae
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Schizosaccharomyces
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Transcrição Gênica
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Cromatina
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Regulação Fúngica da Expressão Gênica
Tipo de estudo:
Diagnostic_studies
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Prognostic_studies
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article