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Cloning, expression and sequence analysis of cDNA for the Ca(2+)-binding photoprotein, mitrocomin
T F Fagan1, Y Ohmiya, J R Blinks
1Osaka Bioscience Institute, Japan.
FEBS Letters
|November 1, 1993
Summary
Mitrocomin, a photoprotein, shares structural similarities with aequorin and clytin. Conserved amino acids suggest a key role in the light emission mechanism of these bioluminescent proteins.
Area of Science:
- Biochemistry
- Molecular Biology
- Bioluminescence
Background:
- Mitrocomin is a photoprotein with a defined primary structure.
- Photoproteins like aequorin and clytin are known for their bioluminescent properties.
Purpose of the Study:
- To analyze the primary structure of mitrocomin.
- To compare mitrocomin with related photoproteins (aequorin, clytin).
- To identify conserved residues potentially involved in light emission.
Main Methods:
- Amino acid sequence analysis.
- Homology comparison with known photoproteins.
Main Results:
- Mitrocomin comprises 190 amino acid residues.
- It possesses three Ca(2+)-binding sites and a C-terminal tyrosine residue.
- Mitrocomin exhibits significant sequence homology with aequorin (67.9%) and clytin (60.7%).
- Eight specific amino acid residues (Cys152, His58, His169, Trp12, Trp86, Trp108, Trp129, Trp173) are conserved across all three photoproteins.
Conclusions:
- The conserved amino acid residues are likely crucial for the light-emitting function of mitrocomin, aequorin, and clytin.
- Structural and sequence similarities highlight a conserved mechanism for bioluminescence in these proteins.