Title

Phylogenetic analysis of fungal centromere H3 proteins

UMMS Affiliation

Department of Molecular Genetics and Microbiology

Date

10-10-2006

Document Type

Article

Subjects

Amino Acid Sequence; Centromere; DNA, Fungal; Evolution, Molecular; Fungal Proteins; Genes, Fungal; Genetic Complementation Test; Histones; Likelihood Functions; Molecular Sequence Data; *Phylogeny; Protein Folding; Protein Structure, Tertiary; Saccharomyces cerevisiae; Sequence Analysis, DNA; Sequence Homology, Amino Acid; Species Specificity

Disciplines

Life Sciences | Medicine and Health Sciences

Abstract

Centromere H3 proteins (CenH3's) are variants of histone H3 specialized for packaging centromere DNA. Unlike canonical H3, which is among the most conserved of eukaryotic proteins, CenH3's are rapidly evolving, raising questions about orthology and conservation of function across species. To gain insight on CenH3 evolution and function, a phylogenetic analysis was undertaken on CenH3 proteins drawn from a single, ancient lineage, the Fungi. Using maximum-likelihood methods, a credible phylogeny was derived for the conserved histone fold domain (HFD) of 25 fungal CenH3's. The collection consisted mostly of hemiascomycetous yeasts, but also included basidiomycetes, euascomycetes, and an archaeascomycete. The HFD phylogeny closely recapitulated known evolutionary relationships between the species, supporting CenH3 orthology. The fungal CenH3's lacked significant homology in their N termini except for those of the Saccharomyces/Kluyveromyces clade that all contained a region homologous to the essential N-terminal domain found in Saccharomyces cerevisiae Cse4. The ability of several heterologous CenH3's to function in S. cerevisiae was tested and found to correlate with evolutionary distance. Domain swapping between S. cerevisiae Cse4 and the noncomplementing Pichia angusta ortholog showed that species specificity could not be explained by the presence or absence of any recognized secondary structural element of the HFD.

Rights and Permissions

Citation: Genetics. 2006 Nov;174(3):1481-92. Epub 2006 Oct 8. Link to article on publisher's site

Related Resources

Link to Article in PubMed

Journal Title

Genetics

PubMed ID

17028330