Two fast-type fibers in claw closer and abdominal deep muscles of the Australian freshwater crustacean, Cherax destructor, differ in Ca2+ sensitivity and troponin-I isoforms

Journal of Experimental Zoology. Part A, Comparative Experimental Biology
Annette KoendersDonald L Mykles

Abstract

One type of fast fiber and two types of slow (slow-twitch, S1 and slow-tonic, S2) fibers are found in decapod crustacean skeletal muscles that differ in contractile properties and myofibrillar protein isoform compositions. In this study the structural characteristics, protein isoform compositions, and Ca2+-activation properties of fast fibers in the claw closer (F1) and abdominal deep flexor (F2) muscles of Cherax destructor were analyzed. For comparison, myofibrillar protein isoform compositions of slow (long-sarcomere) fibers from claw and abdomen were also determined; our results indicate that the slow fibers in the claw closer were the slow-twitch (S1) type and those in the abdominal superficial flexor were primarily slow-tonic (S2) type. F1 fibers had shorter resting sarcomere lengths (2.93 microm in unstretched fibers and 3.06 microm in stretched fibers) and smaller fiber diameter (256 microm) than F2 fibers (sarcomere lengths 3.48 microm in unstretched and 3.46 microm in stretched; 747 microm diameter). Moreover, F1 fibers showed a narrower range in sarcomere lengths than F2 fibers (2.81 to 3.28 microm vs. 2.47 to 4.05 micro m in unstretched fibers). Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunoblo...Continue Reading

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Citations

Jun 16, 2010·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Erica ChaoDonald L Mykles
Mar 5, 2009·Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology·Bo Kwang KimHyun-Woo Kim
Mar 23, 2007·Journal of Experimental Zoology. Part A, Ecological Genetics and Physiology·Scott MedlerDonald L Mykles
Jul 1, 2005·Physiological Reviews·Scott L Hooper, Jeffrey B Thuma
Feb 17, 2009·The Journal of Experimental Biology·Michael J PerryScott Medler

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