Journal Title
Title of Journal: Fish Physiol Biochem
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Abbravation: Fish Physiology and Biochemistry
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Publisher
Springer Netherlands
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Authors: Riaz Ahmad Absarul Hasnain
Publish Date: 2012/10/20
Volume: 39, Issue: 3, Pages: 721-731
Abstract
A modified SDSPAGE system has been employed to resolve polymorphic myosin heavy chain MyHC isoforms in different muscle types of three freshwater teleosts displaying different modes of respiration adaptive features and life styles Investigated species include accessory airbreather Channa punctata along with exclusive aquatic breather major carps Labeo rohita and Catla catla All the selected species show specificity and expressivity of at least three MyHC isoforms one each in red head and pectoral muscles Chymotryptic peptide maps unambiguously support substructural individuality of each MyHC isoforms with the typespecific dispersal of chymotryptic cleavage sites Specific Ca2+ and Mg2+ATPase activities of natural actomyosin NAM of lateral line red muscle of C punctata were low and less sensitive to pH but sensitive to KCl concentrations between 005 and 015 M In comparison the specific enzymatic activities of NAM of red muscle from the carps L rohita and C catla were substantially high with prominent peaks at pH 75 and near insensitivity to 005–015 M KCl while C punctata had shown a different response at these molarities Thus the data favor a correlation between breathing modes and life style and the differences in pH or ionic strength sensitivities of ATPases Unique profiles of peptide maps and the dispersal patterns of hydrophobic residues cleavage sites of chymotrypsin in MyHC of different muscle types further reflect individuality of their evolutionary histories
Keywords:
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