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How Phosphocreatine Buffers Cyclic Changes in ATP Demand in Working Muscle

  • C. Funk
  • A. ClarkJr.
  • R. J. Connett
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 248)

Abstract

What is the role of phosphocreatine in energy metabolism of muscle tissue? The various roles that have been proposed over the last 50 years all fall into two categories: spatial transport and storage of high-energy phosphate. We analyse the function of phosphocreatine as a temporal buffer within a muscle cell on the basis of a simple model. Our model is based on the assumption of equilibrium of the creatine kinase reaction
$$Mg.ADP + PCr + {H^ + }Mg.ATP + Cr.$$
Also, all species are allowed to diffuse freely between mitochondria and myofibrils. In the absence of any anatomical evidence and following the reasoning of Meyer et al.(1984), we do not incorporate compartmentation of ATP and ADP in mitochondrial or myofibrillar pools.

Keywords

Adenylate Kinase Total Creatine Temporal Buffer Creatine Concentration Creatine Kinase Reaction 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Atkinson, D. E., 1977, “Cellular Energy Metabolism and Its Regulation,” Academic Press, New York.Google Scholar
  2. Connett, R. J., 1988, Analysis of metabolic control: new insights using scaled creatine kinase model, Am. J.Physiol. 254:R949.PubMedGoogle Scholar
  3. Mainwood, G. W. and Rakusan, K., 1982, A model for intracellular energy transport, Can. J. Physiol.Pharmacol. 60:98.PubMedCrossRefGoogle Scholar
  4. Meyer, R. A., 1988, A linear model of muscle respiration explains monoexponential Phosphokreatine changes, Am. J.Physiol. 254:C548.PubMedGoogle Scholar
  5. Meyer, R. A., Sweeney, H. L. and Kushmerick, M., 1984, A simple analysis of the “phosphocreatine shuttle”, Am.J.Physiol. 246:C365.PubMedGoogle Scholar

Copyright information

© Plenum Press, New York 1989

Authors and Affiliations

  • C. Funk
    • 1
  • A. ClarkJr.
    • 1
  • R. J. Connett
    • 2
  1. 1.Department of Mechanical EngineeringUniversity of RochesterRochesterUSA
  2. 2.Department of PhysiologyUniversity of RochesterRochesterUSA

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