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Calcium-dependent molecular spring elements in the giant protein titin.


ABSTRACT: Titin (also known as connectin) is a giant protein with a wide range of cellular functions, including providing muscle cells with elasticity. Its physiological extension is largely derived from the PEVK segment, rich in proline (P), glutamate (E), valine (V), and lysine (K) residues. We studied recombinant PEVK molecules containing the two conserved elements: approximately 28-residue PEVK repeats and E-rich motifs. Single molecule experiments revealed that calcium-induced conformational changes reduce the bending rigidity of the PEVK fragments, and site-directed mutagenesis identified four glutamate residues in the E-rich motif that was studied (exon 129), as critical for this process. Experiments with muscle fibers showed that titin-based tension is calcium responsive. We propose that the PEVK segment contains E-rich motifs that render titin a calcium-dependent molecular spring that adapts to the physiological state of the cell.

SUBMITTER: Labeit D 

PROVIDER: S-EPMC263879 | biostudies-literature | 2003 Nov

REPOSITORIES: biostudies-literature

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Calcium-dependent molecular spring elements in the giant protein titin.

Labeit Dietmar D   Watanabe Kaori K   Witt Christian C   Fujita Hideaki H   Wu Yiming Y   Lahmers Sunshine S   Funck Theodor T   Labeit Siegfried S   Granzier Henk H  

Proceedings of the National Academy of Sciences of the United States of America 20031030 23


Titin (also known as connectin) is a giant protein with a wide range of cellular functions, including providing muscle cells with elasticity. Its physiological extension is largely derived from the PEVK segment, rich in proline (P), glutamate (E), valine (V), and lysine (K) residues. We studied recombinant PEVK molecules containing the two conserved elements: approximately 28-residue PEVK repeats and E-rich motifs. Single molecule experiments revealed that calcium-induced conformational changes  ...[more]

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