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A novel human Mcm protein: homology to the yeast replication protein Mis5 and chromosomal location
H P Holthoff1, H Hameister, R Knippers
1Division of Biology, Universität Konstanz, Germany.
Abstract:
Mcm proteins perform functions related to the regulation of eukaryotic genome replication. Previous work has shown that human cells contain at least five different Mcm proteins. We report now the amino acid sequence of an additional human Mcm protein, p105Mcm, and show that it is homologous to the Schizosaccharomyces pombe protein Mis5. We demonstrate that the gene for protein p105Mcm (HGMW-approved symbol, MCM6) is located on human chromosome 2q14-q21. All six known human Mcm proteins have now been sequenced and compared to their yeast counterparts.
Insights
Researchers identified a new human Mcm protein, p105Mcm (MCM6), crucial for eukaryotic genome replication. This discovery completes the sequencing of all known human Mcm proteins, enabling comparisons with yeast counterparts.
Area of Science:
- Molecular Biology
- Genetics
- Cell Biology
Background:
- Mcm proteins are essential for regulating eukaryotic genome replication.
- Human cells possess at least five distinct Mcm proteins.
- Previous research established the presence and general function of Mcm proteins.
Purpose of the Study:
- To report the amino acid sequence of an additional human Mcm protein, p105Mcm.
- To determine the chromosomal location of the gene encoding p105Mcm.
- To facilitate comparative analysis between human and yeast Mcm proteins.
Main Methods:
- Amino acid sequencing of the p105Mcm protein.
- Homology analysis comparing p105Mcm to known proteins, including yeast Mis5.
- Gene mapping techniques to identify the chromosomal location of the MCM6 gene.
Main Results:
- The amino acid sequence of human p105Mcm was determined.
- p105Mcm was shown to be homologous to the fission yeast protein Mis5.
- The gene for p105Mcm (MCM6) was localized to human chromosome 2q14-q21.
- All six known human Mcm proteins have now been sequenced.
Conclusions:
- The identification and sequencing of p105Mcm (MCM6) contribute to a comprehensive understanding of the human Mcm protein family.
- The localization of MCM6 provides a genetic marker for further studies.
- The complete sequencing of human Mcm proteins allows for detailed evolutionary and functional comparisons with their yeast orthologs, advancing the study of genome replication.