The overall objective of this proposal is to continue studies aimed at developing new information on the molecular basis of contraction and its control in cardiac and various types of skeletal muscle. Proteins of the contractile (myosin and actin) and regulatory (troponin, tropomyosin) machinery will be characterized by chemical, physico-chemical and enzymatic methods. The interactions of the relevant proteins with each other and with metal ions, in particular with Ca2+, lanthanides and nucleotides will be investigated with a view to obtaining a better insight into the process of mechano-chemical transduction and Ca2+ dependent regulation in vivo. Efforts will be made to relate chemical features of the part of myosin which contains the nucleotide and actin binding sites to dynamic (motional) aspects, which in turn are likely to underlie the cyclic mechanism of actin-myosin interaction. The Ca2+ dependent regulatory process will be studied by focusing on troponin and its subunits and their interaction with each other and the contractile system. The interaction with Ca2+ will be studied by direct binding and with the use of various spectroscopic probes. Studies will be continued on the mechanism of activity induced transformation in skeletal muscle with the hope of gaining new insights into the process by which gene expression is changed. Preliminary results indicating the appearance of a new myosin subunit gene product will be followed up. One hopes that the results obtained in the course of this work will shed light not only on processes specific for normal and diseased muscle tissues but will be of interest in other complex systems involving multiple protein-protein interactions and regulatory processes.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Method to Extend Research in Time (MERIT) Award (R37)
Project #
5R37HL005949-31
Application #
3485234
Study Section
Special Emphasis Panel (NSS)
Project Start
1975-05-01
Project End
1995-06-30
Budget Start
1991-07-19
Budget End
1992-06-30
Support Year
31
Fiscal Year
1991
Total Cost
Indirect Cost
Name
Boston Biomedical Research Institute
Department
Type
DUNS #
058893371
City
Watertown
State
MA
Country
United States
Zip Code
02472
Leszyk, J; Tao, T; Nuwaysir, L M et al. (1998) Identification of the photocrosslinking sites in troponin-I with 4-maleimidobenzophenone labelled mutant troponin-Cs having single cysteines at positions 158 and 21. J Muscle Res Cell Motil 19:479-90
Luo, Y; Wu, J L; Gergely, J et al. (1997) Troponin T and Ca2+ dependence of the distance between Cys48 and Cys133 of troponin I in the ternary troponin complex and reconstituted thin filaments. Biochemistry 36:11027-35
Tan, R Y; Mabuchi, Y; Grabarek, Z (1996) Blocking the Ca2+-induced conformational transitions in calmodulin with disulfide bonds. J Biol Chem 271:7479-83
Grabarek, Z; Mabuchi, Y; Gergely, J (1995) Properties of troponin C acetylated at lysine residues. Biochemistry 34:11872-81
Kobayashi, T; Grabarek, Z; Gergely, J et al. (1995) Extensive interactions between troponins C and I. Zero-length cross-linking of troponin I and acetylated troponin C. Biochemistry 34:10946-52
Kobayashi, T; Tao, T; Gergely, J et al. (1994) Structure of the troponin complex. Implications of photocross-linking of troponin I to troponin C thiol mutants. J Biol Chem 269:5725-9
Grabarek, Z; Tao, T; Gergely, J (1992) Molecular mechanism of troponin-C function. J Muscle Res Cell Motil 13:383-93
Kobayashi, T; Tao, T; Grabarek, Z et al. (1991) Cross-linking of residue 57 in the regulatory domain of a mutant rabbit skeletal muscle troponin C to the inhibitory region of troponin I. J Biol Chem 266:13746-51
Fuchtbauer, E M; Rowlerson, A M; Gotz, K et al. (1991) Direct correlation of parvalbumin levels with myosin isoforms and succinate dehydrogenase activity on frozen sections of rodent muscle. J Histochem Cytochem 39:355-61
Gusev, N B; Grabarek, Z; Gergely, J (1991) Stabilization by a disulfide bond of the N-terminal domain of a mutant troponin C (TnC48/82). J Biol Chem 266:16622-6

Showing the most recent 10 out of 19 publications