Abstract:
:The vertebrate striated muscle protein titin is thought to play a critical rôle in myofibril assembly and passive tension. The recently determined complete primary structure of titin revealed a modular architecture that opens the way to a structural characterisation and the understanding of essential properties of this molecule through dissection into units that are structurally and/or functionally relevant. To understand the assembly process of titin, and ultimately the molecular basis of its elastic behaviour, we studied the thermodynamic properties of module pairs, the smallest structural unit that includes a module-module interface. Thus, selected module pairs and their component single modules from the I-band part of the titin molecule were expressed in Escherichia coli and their heat-induced and denaturant-induced unfolding was investigated with a combination of techniques (circular dichroism, fluorescence spectroscopy and nuclear magnetic resonance). The stabilities of single modules and pairs were determined from denaturation experiments. The module interface was also modelled on the basis of the sequence alignment of all approximately 40 immunoglobulin like modules from the I-band and the known structure of one of them. Our results show that all modules and module pairs examined are independently folded in solution. When covalently linked, although weakly interacting, they still behave as autonomous co-operative units upon unfolding. These observations lead us to suggest that folding of titin in vitro is a hierarchical event and that weak interactions between its adjacent modules must only partly account for its presumed elastic function.
journal_name
J Mol Bioljournal_title
Journal of molecular biologyauthors
Politou AS,Gautel M,Improta S,Vangelista L,Pastore Adoi
10.1006/jmbi.1996.0050subject
Has Abstractpub_date
1996-02-02 00:00:00pages
604-16issue
4eissn
0022-2836issn
1089-8638pii
S0022-2836(96)90050-9journal_volume
255pub_type
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