Mini-chromosome maintenance (MCM) proteins form heterohexameric complex (MCM2-7) to serve as licensing factor for DNA replication to make sure that genomic DNA is replicated completely and accurately once during S phase in a single cell cycle. MCMs were initially identified in yeast for their role in plasmid replication or cell cycle progression. Each of six MCM contains highly conserved sequence called "MCM box", which contains two ATPase consensus Walker A and Walker B motifs. Studies on MCM proteins showed that (a) the replication origins are licensed by stable binding of MCM2-7 to form pre-RC (pre-replicative complex) during G1 phase of the cell cycle, (b) the activation of MCM proteins by CDKs (cyclin-dependent kinases) and DDKs (Dbf4-dependent kinases) and their helicase activity are important for pre-RC to initiate the DNA replication, and (c) the release of MCMs from chromatin renders the origins "unlicensed". DNA replication licensing in plant is, in general, less characterized. The MCMs have been reported from Arabidopsis, maize, tobacco, pea and rice, where they are found to be highly expressed in dividing tissues such as shoot apex and root tips, localized in nucleus and cytosol and play important role in DNA replication, megagametophyte and embryo development. The identification of six MCM coding genes from pea and Arabidopsis suggest six distinct classes of MCM protein in higher plant, and the conserved function right across the eukaryotes. This overview of MCMs contains an emphasis on MCMs from plants and the novel role of MCM6 in abiotic stress tolerance.
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Evidence ID | Analyze ID | Gene/Complex | Systematic Name/Complex Accession | Qualifier | Gene Ontology Term ID | Gene Ontology Term | Aspect | Annotation Extension | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Phenotype | Experiment Type | Experiment Type Category | Mutant Information | Strain Background | Chemical | Details | Reference |
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Evidence ID | Analyze ID | Gene | Gene Systematic Name | Disease Ontology Term | Disease Ontology Term ID | Qualifier | Evidence | Method | Source | Assigned On | Reference |
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Evidence ID | Analyze ID | Regulator | Regulator Systematic Name | Target | Target Systematic Name | Direction | Regulation of | Happens During | Regulator Type | Direction | Regulation Of | Happens During | Method | Evidence | Strain Background | Reference |
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Site | Modification | Modifier | Source | Reference |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Allele | Assay | Annotation | Action | Phenotype | SGA score | P-value | Source | Reference | Note |
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Evidence ID | Analyze ID | Interactor | Interactor Systematic Name | Interactor | Interactor Systematic Name | Assay | Annotation | Action | Modification | Source | Reference | Note |
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Complement ID | Locus ID | Gene | Species | Gene ID | Strain background | Direction | Details | Source | Reference |
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Evidence ID | Analyze ID | Dataset | Description | Keywords | Number of Conditions | Reference |
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