Campus Units

Zoology, Molecular, Cellular and Developmental Biology, Genetics

Document Type

Article

Publication Version

Published Version

Publication Date

1995

Journal or Book Title

Nucleic Acids Research

Volume

23

Issue

10

First Page

1766

Last Page

1774

DOI

10.1093/nar/23.10.1766

Abstract

Computer analyses of the DNA replication origin region in the amplified rRNA genes of Tetrahymena thermophlla identified a potential initiation zone in the 5′ NTS [Dobbs, Shaiu and Benbow (1994), Nucleic Acids Res . 22, 2479–2489]. This region consists of a putative DNA unwinding element (DUE) aligned with predicted bent DNA segments, nuclear matrix or scaffold associated region (MAR/SAR) consensus sequences, and other common modular sequence elements previously shown to be clustered in eukaryo-tic chromosomal origin regions. In this study, two mung bean nuclease-hypersensitive sites In super-coiled plasmid DNA were localized within the major DUE-IIke element predicted by thermodynamic analyses. Three restriction fragments of the 5′ NTS region predicted to contain bent DNA segments exhibited anomalous migration characteristic of bent DNA during electrophoresls on polyacrylamide gels. Restriction fragments containing the 5′NTS region bound Tetrahymena nuclear matrices in an In vitro binding assay, consistent with an association of the replication origin region with the nuclear matrix In vivo. The direct demonstration in a protozoan origin region of elements previously identified in Drosophila , chick and mammalian origin regions suggests that clusters of modular structural elements may be a conserved feature of eukaryotic chromosomal origins of replication.

Comments

This article is from Nucleic Acids Research 23 (1995): 1766, doi: 10.1093/nar/23.10.1766. Posted with permission.

Copyright Owner

Oxford University Press

Language

en

File Format

application/pdf

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