Taxonomic Distribution, Phylogenetic Relationship, and Domain Conservation of CRISPR-Associated Cas Proteins
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View abstract on PubMed
Summary
This summary is machine-generated.CRISPR-Cas proteins (Cas3, Cas9, and Cas10) evolved rapidly with varying conservation. Cas3 and Cas9 show conserved domains under negative selection, while Cas10 exhibits neutral or positive selection, indicating rapid divergence.
Area Of Science
- Microbiology
- Genetics
- Evolutionary Biology
Background
- CRISPR (Clustered Regularly Interspaced Short Palindromic Repeats) is a bacterial defense system.
- CRISPR systems (Types I, II, III) utilize signature proteins Cas3, Cas9, and Cas10.
- These proteins likely evolved rapidly due to diverse selective pressures.
Purpose Of The Study
- To analyze the evolutionary distribution, phylogeny, and structure-function constraints of Cas3, Cas9, and Cas10 proteins.
- To understand the evolutionary dynamics of key CRISPR-associated proteins.
Main Methods
- Genomic analysis of homologous proteins.
- Phylogenetic analysis of Cas protein families.
- Structure-function constraint analysis.
Main Results
- Cas3, Cas9, and Cas10 are prevalent in Bacteroidetes, Firmicutes, and Proteobacteria.
- Proteins share 30-50% amino acid identity, indicating rapid evolution.
- Cas3 and Cas9 have conserved domains under negative selection; Cas10 domains show neutral/positive selection.
Conclusions
- CRISPR-associated proteins exhibit diverse evolutionary trajectories.
- Cas3 and Cas9 are more conserved, suggesting functional constraints.
- Cas10's rapid divergence implies less stringent structure-function constraints.
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