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PDOC00662
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1995-07-26
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* MCM2/3/5 family signature *
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Proteins shown to be required for the initiation of eukaryotic DNA replication
share a highly conserved domain of about 210 amino-acid residues [1,2,3]. The
latter shows some similarities [4] with that of various other families of DNA-
dependent ATPases. Proteins known to contain this domain are listed below.
- Yeast minichromosome maintenance protein 2 (gene MCM2). MCM2 is needed for
the efficient function of certain replication origins.
- Yeast minichromosome maintenance protein 3 (gene MCM3). MCM3 possibly plays
a direct role in the initiation of chromosomal DNA replication by
interacting directly with autonomously replicating sequences (ARS).
- Yeast minichromosome maintenance protein 5 (gene MCM5 or CDC46). Like MCM2
and MCM3, this protein is also involved in the initiation of DNA
replication and interacts directly with replication origins. A partial
sequence of a human homolog is also available.
- Schizosaccharomyces pombe cell division control protein 21 (gene cdc21).
This protein, required for S phase execution, has also been partially
sequenced in yeast, human and in Xenopus.
- Mammalian DNA polymerase alpha holoenzyme-associated protein P1.
- Caenorhabditis elegans hypothetical protein ZK632.1.
The presence of a putative ATP-binding domain implies that these proteins may
be involved in an ATP-consuming step in the initiation of DNA replication in
eukaryotes.
As a signature pattern, we selected a perfectly conserved heptapeptide that
represents a special version of the B motif found in ATP-binding proteins.
-Consensus pattern: I-D-E-F-D-K-M
-Sequences known to belong to this class detected by the pattern: ALL.
-Other sequence(s) detected in SWISS-PROT: NONE.
-Expert(s) to contact by email: Koonin E.V.
koonin@ncbi.nlm.nih.gov
-Last update: June 1994 / Text revised.
[ 1] Coxon A., Maundrell K., Kearsey S.E.
Nucleic Acids Res. 20:5571-5577(1992).
[ 2] Hu B., Burkhart R., Schulte D., Musahl C., Knippers R.
Nucleic Acids Res. 21:5289-5293(1993).
[ 3] Tye B.-K.
Trends Cell Biol. 4:160-166(1994).
[ 4] Koonin E.V.
Nucleic Acids Res. 21:2541-2547(1993).