Abstract
Contraction is modulated in many striated muscles by Ca2+-calmodulin dependent phosphorylation of the myosin regulatory light chain (RLC) by myosin light chain kinase. We have investigated the biochemical mechanism of RLC phosphorylation in tarantula muscle to better understand the basis of myosin-linked regulation. In an earlier study it was concluded that the RLC occurred as two species, both of which could be phosphorylated, potentiating contraction. Here we present evidence that only a single species exists, and that this can be phosphorylated at one or two sites. In relaxed muscle we find evidence for a substantial level of basal phosphorylation at the first site. This is augmented on activation, followed by partial phosphorylation of the second site. We find in addition that Ca2+ has a dual effect on light chain phosphorylation, depending on its concentration. At low concentration (relaxing conditions) only basal phosphorylation is observed, while at higher concentrations (activating conditions) RLC phosphorylation is stimulated. At still higher Ca2+ concentrations we find partial inhibition of RLC phosphorylation, suggesting an additional mechanism by which the muscle cell can fine tune contractile activity by controlling the level of free Ca2+.
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Adhikari BB, Somerset J, Stull JT and Fajer PG (1999) Dynamic modulation of the regulatory domain of myosin heads by pH, ionic strength, and RLC phosphorylation in synthetic myosin filaments. Biochemistry 38: 3127-3132.
Bárány K and Bárány M (1979) Phosphorylation-dephosphorylation of the 18.000 Dalton light chain of myosin during the contraction-relaxation cycle of frog muscle. J Biol Chem 254: 3617-3623.
Bers DM, Patton CH and Nuccitelli R (1994) A practical guide to the preparation of Ca2+ buffers. In: Nuccitelli R (ed) Methods in Cell Biology, (vol. 40, pp. 3-29). Academic Press, New York.
Chantler PD and Szent-Györgyi AG (1980) Regulatory light-chains and scallop myosin: full dissociation, reversibility and co-operative effects. J Mol Biol 138: 473-492.
Craig R, Padrón R and Kendrick-Jones J (1987) Structural changes accompanying phosphorylation of tarantula muscle myosin filaments. J Cell Biol 105: 1319-1327.
Crowther RA, Padron R and Craig R (1985) Arrangement of the heads of myosin in relaxed thick filaments from tarantula muscle. J Mol Biol 184: 429-439.
Ebashi S and Endo M (1968) Calcium ion and muscle contraction. Prog Biophys Mol Biol 18: 123-183.
Ellis CH (1949) The mechanism of extension in the legs of spiders. Biol Bull 46: 41-50.
Gallagher PJ, Herring BP and Stull JT (1997) Myosin light chain kinases. J Muscle Res Cell Motil 18: 1-16.
Hartshorne D (1987) Biochemistry of the contractile process in smooth muscle. In: Johnson LR (ed) Physiology of the Gastrointestinal Tract, (pp. 423-482). Raven Press, New York.
Hervieu G (1997) A quick and safe method for destaining Coomassie-Blue-stained protein gels. Technical Tips Online. Number T01089.
Hollingworth S, Zhao M and Baylor SM (1996) The amplitude and time course of the myoplasmic free [Ca2+] transient in fast-twitch fibers of mouse muscle. J Gen Physiol 108: 455-469.
Ikebe M and Hartshorne DJ (1985) Phosphorylation of smooth muscle myosin at two distinct sites by myosin light chain kinase. J Biol Chem 260: 10027-10031.
Ikebe M and Reardon S (1990) Phosphorylation of smooth myosin light chain kinase by smooth muscle Ca2+/calmodulin-dependent multifunctional protein kinase. J Biol Chem 265: 8975-8978.
Kamm KE and Stull JT (1985) The function of myosin and myosin light chain kinase phosphorylation in smooth muscle. Annu Rev Pharmacol Toxicol 25: 593-620.
Kerrick W and Bolles L (1981) Regulation of Ca2+-activated tension in Limulus striated muscle. Pflugers Arch 392: 121-124.
Klug GA, Botterman BR and Stull JT (1982) The effect of low frequency stimulation on myosin light chain phosphorylation in skeletal muscle. J Biol Chem 257: 4688-4690.
Lehman W and Szent-Györgyi AG (1975) Regulation of muscular contraction. Distribution of actin control and myosin control in the animal kingdom. J Gen Physiol 66: 1-30.
Levine RJC, Kensler RW, Reedy MC, Hofmann W and King HA (1983) Structure and paramyosin content of tarantula thick filaments. J Cell Biol 97: 186-195.
Levine RJC, Chantler PD, Kensler RW and Woodhead JL (1991) Effects of phosphorylation by myosin light chain kinase on the structure of Limulus thick filaments. J Cell Biol 113: 563-572.
Levine RJC, Davidheiser S, Kensler RW, Kelly AM, Leferovich J and Davies RE (1989) Fibre types in Limulus telson muscles: morphology and histochemistry. J Muscle Res Cell Motil 10: 53-66.
Levine RJC, Kensler RW, Yang Z, Stull JT and Sweeney HL (1996) Myosin light chain phosphorylation affects the structure of rabbit skeletal muscle thick filaments. Biophys J 71: 898-907.
Levine RJC, Yang Z, Epstein ND, Fananapazir L, Stull JT and Sweeney HL (1998) Structural and functional responses of mammalian thick filaments to alteration in myosin regulatory light chains. J Struct Biol 122: 149-161.
Manning DR and Stull JT (1979) Myosin light chain phosphorylation and phosphorylase A activity in rat extensor digitorum longus muscle. Biochem Biophys Res Commun 90: 164-170.
Manning DR and Stull JT (1982) Myosin light chain phosphorylation-dephosphorylation in mammalian skeletal muscle. Am J Physiol 242: C234-C241.
Miledi R, Parker I and Zhu PH (1982) Calcium transients evoked by action potentials in frog twitch muscle fibres. J Physiol 333: 655-679.
Moore RL, Houston ME, Iwamoto GA and Stull JT (1985) Phosphorylation of rabbit skeletal muscle myosin in situ. J Cell Physiol 125: 301-305.
Moussavi RS, Kelley CA and Adelstein RS (1993) Phosphorylation of vertebrate nonmuscle and smooth muscle myosin heavy chains and light chains. Mol Cell Biochem 127/128: 219-227.
Offer G, Knight PJ, Burgess SA, Álamo L and Padrón R (2000) A new model for the surface arrangement of myosin molecules in tarantula thick filaments. J Mol Biol 298: 239-260.
Padrón R, Álamo L, Murgich J and Craig R (1998) Towards an atomic model of the thick filaments of muscle. J Mol Biol 275: 35-41.
Padrón R, Granados M, Álamo L, Guerrero JG and Craig R (1992) Visualization of myosin helices in sections of rapidly frozen relaxed tarantula muscle. J Struct Biol 108: 269-276.
Padrón R, Panté N, Sosa H and Kendrick-Jones J (1991) X-ray diffraction study of the structural changes accompanying phosphorylation of tarantula muscle. J Muscle Res Cell Motil 12: 235-241.
Panté N, Sosa H and Padrón R (1988) Estudio por difracción de rayos-X de los cambios estructurales que acompañan la fosforilación de los filamentos gruesos de músculo de tarántula. Acta Cient Ven 39: 230-236.
Pato M and Kere E (1985) Purification and characterization of a smooth muscle myosin phosphatase from turkey gizzards. J Biol Chem 260: 12359-12366.
Perrie WT and Perry SV (1970) An electrophoretic study of the low-molecular-weight components of myosin. Biochem J 119: 31-38.
Perrie WT, Smillie LB and Perry SV (1973) A phosphorylated light-chain component of myosin from skeletal muscle. Biochem J 135: 151-164.
Ritter O, Haase H and Morano I (1999) Regulation of Limulus skeletal muscle contraction. FEBS Lett 446: 233-235.
Saitoh M, Ishikawa T, Matsusima S, Naka M and Hidaka H (1987) Selective inhibition of catalytic activity of smooth muscle myosin light chain kinase. J Biol Chem 262: 7796-7801.
Sato O and Owaga Y (1999) The modulatory effect of MgATP on heterotrimeric smooth muscle myosin phosphatase activity. J Biochem 126: 787-797.
Sellers JR and Adelstein R (1987) Regulation of contractile activity. In: Boyer PD and Krebs EG (eds) The Enzymes, (pp. 381-418). Academic Press, Orlando.
Sellers JR (1981) Phosphorylation-dependent regulation of Limulus myosin. J Biol Chem 256: 9274-9278.
Silver PJ and Stull JT (1982) Quantitation of myosin light chain phosphorylation in small tissue samples. J Biol Chem 257: 6137-6144.
Sobieszeck A (1990) Smooth muscle myosin as a calmodulin binding protein. Affinity increase on filament assembly. J Muscle Res Cell Motil 11: 114-124.
Stepkowski D, Szczesna D, Wrotek M and Kakol I (1985) Factors influencing interaction of phosphorylated and dephosphorylated myosin with actin. Biochim Biophys Acta 831: 321-329.
Stull JT and High C (1977) Phosphorylation of skeletal muscle contractile proteins in vivo. Biochem Biophys Res Commun 77: 1078-1083.
Stull JT, Tansey MG, Tang D-C, Word RA and Kamm KE (1993) Phosphorylation of myosin light chain kinase: a cellular mechanism for Ca2+ desensitization. Mol Cell Biochem 127/128: 229-237.
Sweeney HL and Stull JT (1986) Phosphorylation of myosin in permeabilized mammalian cardiac and skeletal muscle cells. Am J Physiol 250: C657-C660.
Sweeney HL, Bowman BF and Stull JT (1993) Myosin light chain phosphorylation in vertebrate striated muscle: regulation and function. Am J Physiol 264: C1085-C1095.
Szent-Györgyi AG (1996) Regulation of contraction by calcium binding myosins. Biophys Chem 59: 357-363.
Szent-Györgyi AG, Szentkiralyi EM and Kendrick-Jones J (1973) The light chains of scallop myosin as regulatory subunits. J Mol Biol 74: 179-203.
Tang D-C, Stull JT, Kubota Y and Kamm KE (1992) Regulation of the Ca2+ dependence of smooth muscle contraction. J Biol Chem 267: 11839-11845.
Tansey MG, Luby-Phelps K, Kamm KE and Stull JT (1994) Ca2+-dependent phosphorylation of myosin light chain kinase decreases the Ca2+ sensitivity of light chain phosphorylation within smooth muscle cells. J Biol Chem 269: 9912-9920.
Tansey MG, Word RA, Hidaka H, Singer HA, Schworer CM, Kamm KE and Stull JT (1992) Phosphorylation of myosin light chain kinase by the multifunctional calmodulin-dependent protein kinase II in smooth muscle cells. J Biol Chem 267: 12511-12516.
Wang F, Martin BM and Sellers JR (1993) Regulation of actomyosin interactions in Limulus muscle proteins. J Biol Chem 268: 3776-3780.
Weber A and Murray JM (1973) Molecular control mechanisms in muscle contraction. Physiol Rev 53: 612-673.
Wray JS (1982) Organization of myosin in invertebrate thick filaments. In: Twarog BM, Levine RJC and Dewey MM (eds) Basic Biology of Muscles: A Comparative Approach, (pp. 29-36). Raven Press, New York.
Yang Z, Stull JT, Levine RJC and Sweeney HL (1998) Changes in interfilament spacing mimic the effects of myosin regulatory light chain phosphorylation in rabbit psoas fibers. J Struct Biol 122: 139-148.
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Hidalgo, C., Craig, R., Ikebe, M. et al. Mechanism of phosphorylation of the regulatory light chain of myosin from tarantula striated muscle. J Muscle Res Cell Motil 22, 51–59 (2001). https://doi.org/10.1023/A:1010388103354
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DOI: https://doi.org/10.1023/A:1010388103354