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Temperature acclimation induces light meromyosin isoforms with different primary structures in carp fast skeletal
Biochemical and Biophysical Research Communications
|March 8, 1995
Summary
Carp acclimated to different temperatures show variations in light meromyosin (LMM) fragments. Temperature affects LMM structure, influencing protein fragments and amino acid sequences in carp.
Area of Science:
- Biochemistry
- Molecular Biology
- Aquatic Physiology
Background:
- Temperature acclimation is a critical physiological process in ectotherms like carp.
- Light meromyosin (LMM) is a key component of the myosin motor protein, essential for muscle contraction.
- Understanding LMM structural changes due to temperature can elucidate muscle adaptation mechanisms.
Purpose of the Study:
- To investigate the impact of different acclimation temperatures (10°C vs. 30°C) on carp light meromyosin (LMM) fragments.
- To analyze the N-terminal amino acid sequences of LMM fragments from carp acclimated to varying temperatures.
- To identify temperature-induced alterations in LMM structure at the molecular level.
Main Methods:
- Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) to separate LMM fragments.
- Microsequence analysis to determine the amino acid sequences of LMM fragments.
- Polymerase chain reaction (PCR) and reverse transcriptase-PCR (RT-PCR) to amplify DNA fragments encoding LMM N-terminal regions.
Main Results:
- Carp acclimated to 10°C yielded LMM fragments of 69kDa, 66kDa, and 62kDa.
- Carp acclimated to 30°C produced additional 74kDa fragments alongside 69kDa, 66kDa, and 62kDa fragments.
- Microsequence analysis revealed distinct N-terminal sequences for 69kDa and 66kDa fragments compared to 62kDa in 10°C-acclimated carp.
- LMM fragments from 30°C-acclimated carp shared sequences with 10°C carp fragments, with a specific amino acid substitution (Ala to Thr) at the second position.
- PCR-based amplification confirmed amino acid substitutions in the LMM N-terminal region between the two acclimation groups.
Conclusions:
- Acclimation temperature significantly influences the fragmentation pattern and N-terminal sequence of carp light meromyosin.
- Temperature-induced structural modifications in carp LMM involve alterations in amino acid sequences, particularly in the N-terminal region.
- These findings contribute to understanding the molecular basis of muscle adaptation to thermal environments in fish.