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Fish myosin alkali light chains originate from two different genes.
L Dalla Libera1, E Carpene, J Theibert
1CNR Unit for Muscle Biology and Physiopathology, Institute of General Pathology, Padova, Italy.
Journal of Muscle Research and Cell Motility
|August 1, 1991
Summary
Fish myosin alkali light chains LC1 and LC3 originate from two distinct genes, unlike in mammals and birds where they arise from a single gene. This study reveals novel insights into fish muscle protein evolution.
Area of Science:
- Biochemistry
- Molecular Biology
- Evolutionary Biology
Background:
- Vertebrate fast skeletal muscle myosins typically feature LC1 and LC3 alkali light chains.
- In birds and mammals, these light chains are understood to derive from a single gene via alternative RNA splicing.
Purpose of the Study:
- To determine the amino acid sequences of mullet white skeletal muscle myosin alkali light chains (LC1 and LC3).
- To investigate the genetic origin of fish myosin alkali light chains and compare it with other vertebrates.
Main Methods:
- Amino acid sequencing of mullet white skeletal muscle myosin alkali light chains.
Main Results:
- The amino acid sequences for mullet LC1 and LC3 were successfully determined.
- A significant number of 29 differences were identified between the mullet LC1 and LC3 sequences.
- These differences were distributed across the entire polypeptide chains of both light chains.
Conclusions:
- Mullet myosin alkali light chains (LC1 and LC3) originate from two separate genes.
- This finding contrasts with the single-gene origin observed in avian and mammalian fast skeletal muscle myosins.
- Suggests a divergent evolutionary pathway for myosin alkali light chains in fish compared to other vertebrates.