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    
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.
M K Knox; A G Szent-Györgyi; C E Trueblood; A Weber; S Zigmond
Related Documents :
12721109 - Extracellular atp-induced calcium channel inhibition mediated by p1/p2y purinoceptors i...
938799 - Identification of separate receptors for adenosine and adenosine 5'-triphosphate in cau...
18484279 - Glucosamine inhibits the synthesis of glycosaminoglycan chains on vascular smooth muscl...
15668229 - Hypoxic modulation of ca2+ signaling in human venous endothelial cells. multiple roles ...
7815059 - Neuronal responses to purinoceptor agonists in the leech central nervous system.
8982499 - P2x-purinoceptors of myenteric neurones from the guinea-pig ileum and their unusual pha...
15056859 - The effects of monobromobimane on calcium and phenylarsineoxide-induced mitochondrial s...
2446249 - On the mechanism of histamine induced enhancement of the cardiac ca2+ current.
7006689 - Effects of actin and calcium ion on chymotryptic digestion of skeletal myosin and their...
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    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Actomyosin / analysis
Adenosine Triphosphatases / analysis
Adenosine Triphosphate / physiology*
Calcium / physiology
Muscle Contraction*
Muscle Relaxation*
Myofibrils / drug effects,  physiology*
Myosins / physiology*
Grant Support
Reg. No./Substance:
56-65-5/Adenosine Triphosphate; 7440-70-2/Calcium; 9013-26-7/Actomyosin; EC 3.6.1.-/Adenosine Triphosphatases; EC

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

Previous Document:  Effects of systemic in vivo interleukin-2 (IL-2) reconstitution in patients with acquired immune def...
Next Document:  The effect of length range on heat rate and power during shortening near in situ length in frog musc...