Document Detail


The effect of low ATP concentrations on relaxation in the myosin regulated myofibrils from scallop.
MedLine Citation:
PMID:  2940259     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Troponin-tropomyosin-regulated myofibrils show a significant increase in ATPase activity and contract in the absence of calcium when the ATP concentration falls significantly below the saturation level. By contrast, the ATPase of the myosin-regulated myofibrils of scallop striated muscle was not activated in the absence of calcium when the ATP concentration was lowered to 10mM. Nevertheless, a very small fraction of crossbridges were active at 10mM ATP resulting in very slow myofibrillar shortening. In contrast to the behaviour of rabbit contractile proteins there was no correlation between myofibrillar shortening and ATP induced turbidity changes of actomyosin taken from scallop.
Authors:
M K Knox; A G Szent-Györgyi; C E Trueblood; A Weber; S Zigmond
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Publication Detail:
Type:  In Vitro; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Journal of muscle research and cell motility     Volume:  7     ISSN:  0142-4319     ISO Abbreviation:  J. Muscle Res. Cell. Motil.     Publication Date:  1986 Apr 
Date Detail:
Created Date:  1986-06-30     Completed Date:  1986-06-30     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  8006298     Medline TA:  J Muscle Res Cell Motil     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  110-4     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Actomyosin / analysis
Adenosine Triphosphatases / analysis
Adenosine Triphosphate / physiology*
Animals
Calcium / physiology
Hydrolysis
Mollusca
Muscle Contraction*
Muscle Relaxation*
Myofibrils / drug effects,  physiology*
Myosins / physiology*
Rabbits
Grant Support
ID/Acronym/Agency:
AM 15693/AM/NIADDK NIH HHS; HL 15692/HL/NHLBI NIH HHS; HL 15835/HL/NHLBI NIH HHS
Chemical
Reg. No./Substance:
56-65-5/Adenosine Triphosphate; 7440-70-2/Calcium; 9013-26-7/Actomyosin; EC 3.6.1.-/Adenosine Triphosphatases; EC 3.6.4.1/Myosins

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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