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Identification of ORC1/CDC6-Interacting Factors in Trypanosoma brucei Reveals Critical Features of Origin Recognition Complex Architecture
- Source :
- PLoS ONE, PLoS ONE, Vol 7, Iss 3, p e32674 (2012)
- Publication Year :
- 2012
- Publisher :
- Public Library of Science (PLoS), 2012.
-
Abstract
- DNA Replication initiates by formation of a pre-replication complex on sequences termed origins. In eukaryotes, the pre- replication complex is composed of the Origin Recognition Complex (ORC), Cdc6 and the MCM replicative helicase in conjunction with Cdt1. Eukaryotic ORC is considered to be composed of six subunits, named Orc1–6, and monomeric Cdc6 is closely related in sequence to Orc1. However, ORC has been little explored in protists, and only a single ORC protein, related to both Orc1 and Cdc6, has been shown to act in DNA replication in Trypanosoma brucei . Here we identify three highly diverged putative T. brucei ORC components that interact with ORC1/CDC6 and contribute to cell division. Two of these factors are so diverged that we cannot determine if they are eukaryotic ORC subunit orthologues, or are parasite- specific replication factors. The other we show to be a highly diverged Orc4 orthologue, demonstrating that this is one of the most widely conserved ORC subunits in protists and revealing it to be a key element of eukaryotic ORC architecture. Additionally, we have examined interactions amongst the T. brucei MCM subunits and show that this has the conventional eukaryotic heterohexameric structure, suggesting that divergence in the T. brucei replication machinery is limited to the earliest steps in origin licensing.
- Subjects :
- General Science & Technology
Protein subunit
Molecular Sequence Data
Trypanosoma brucei brucei
Origin Recognition Complex
lcsh:Medicine
Cell Cycle Proteins
Sequence alignment
Trypanosoma brucei
Biochemistry
Microbiology
DNA replication factor CDT1
03 medical and health sciences
Nucleic Acids
Molecular Cell Biology
parasitic diseases
MD Multidisciplinary
Amino Acid Sequence
lcsh:Science
ORC1
Biology
Phylogeny
030304 developmental biology
Genetics
0303 health sciences
Multidisciplinary
biology
Chromosome Biology
lcsh:R
030302 biochemistry & molecular biology
DNA Helicases
DNA replication
Helicase
DNA
Genomics
biology.organism_classification
Protein Subunits
biology.protein
Origin recognition complex
lcsh:Q
RNA Interference
Protein Multimerization
Sequence Alignment
Cell Division
Research Article
Protein Binding
Subjects
Details
- ISSN :
- 19326203
- Database :
- OpenAIRE
- Journal :
- PLoS ONE, PLoS ONE, Vol 7, Iss 3, p e32674 (2012)
- Accession number :
- edsair.doi.dedup.....b998bef9fbdd5bd48767603b4f9e9435