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Tetrahymena nuclear proteins that bind to a micronucleus-specific sequence during vegetative growth
M Katoh1, Y Watanabe, O Numata
1Institute of Biological Sciences, University of Tsukuba, lbaraki, Japan.
Zoological Science
|August 1, 1996
Summary
C-element binding factors (CBFs) are present in Tetrahymena thermophila vegetative cells. These CBFs bind to specific regions within the C-element, a DNA sequence eliminated during macronuclear development.
Area of Science:
- Molecular biology
- Genetics
- Cell biology
Background:
- Tetrahymena thermophila possesses two nuclei: a transcriptionally silent micronucleus and an active macronucleus.
- Macronuclear development involves extensive programmed DNA rearrangement from the germ-line micronucleus.
- A micronuclear-specific 1.4 kb sequence, the C-element, is eliminated during macronuclear development.
Purpose of the Study:
- To investigate the presence and binding characteristics of factors interacting with the C-element in Tetrahymena thermophila.
- To identify potential regulatory mechanisms governing the elimination of the C-element during macronuclear development.
Main Methods:
- Gel mobility shift assays were employed to detect C-element binding factors (CBFs) in nuclear extracts.
- Competition experiments were utilized to determine specific binding regions and motifs within the C-element.
Main Results:
- C-element binding factors (CBFs) were detected in nuclear extracts from vegetative Tetrahymena thermophila cells.
- CBFs bind to at least two distinct regions within the C-element.
- A conserved sequence motif, 5'-ATAGATTT-3', was identified in the CBF binding regions.
Conclusions:
- Specific DNA-binding proteins (CBFs) interact with the C-element in Tetrahymena thermophila.
- The identified binding motif may play a role in the regulation of C-element processing or elimination during macronuclear development.