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Reconstruction of the Ancestral Sequence of Calsequestrin. Tatyana Nienow BIOL 7020 April 26, 2010. Calsequestrin. Calcium-binding protein found in sarcoplasmic reticulum in muscle High capacity (40-80 mol Ca2+/molecule) Medium affinity (KD = 1 mM) Aspartic acid-rich tail. Calsequestrin. - PowerPoint PPT Presentation
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Reconstruction of the Ancestral Sequence of CalsequestrinTatyana NienowBIOL 7020April 26, 2010
Calsequestrin• Calcium-binding protein
found in sarcoplasmic reticulum in muscle▫ High capacity (40-80 mol
Ca2+/molecule)▫ Medium affinity (KD = 1
mM)▫ Aspartic acid-rich tail
Calsequestrin
•CSQ1▫Found in skeletal and cardiac muscle▫Binds twice as many calcium ions as CSQ2▫Larger negative surface potential
•CSQ2▫Found only in cardiac muscle
Methods
•Collected calsequestrin sequences from NCBI▫Using refseq_rna database
•Aligned in Seaview▫Removed predicted signal sequences and
poly-Asp tails
Methods
•Phylogeny with MrBayes and RAxML•Determined ancestral sequence with
MrBayes and FastML•Corrected ancestral sequence length
▫Convert alignment to treat gaps as characters
▫Calculate ancestral form▫Use ancestral gap sequence to remove
inserted sites from original ancestral sequence
CSQ1
CSQ2
Completed Ancestral Sequences
Comparison to CSQ1 and CSQ2
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