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Fig. 8. Schematic drawing of the N2B and is2 regions of titin and their associated
proteins. DRAL/FHL-2 interacts directly with the N2B and is2 regions and
serves as an adaptor molecule to couple the metabolic enzymes MM-CK, adenylate
kinase and phosphofructokinase to titin. In addition, MM-CK may be bound to
the M-band region of the sarcomere via its association with additional M-band
proteins (not shown here). The domain nomenclature and amino acid numbering
correspond to that of the human cardiac titin sequence [X90568
(Labeit and Kolmerer,
1995)].