Birch fiber structure

A protein with a similar dumbell shape and structure is troponin C of skeletal muscles. Troponin C binds to a complex of proteins that assemble on the thin actin filaments of muscle fibers and control con-trachon in response to changes in the calcium ion con-centrahon (Chapter 19). Other proteins that contain EF-hand mohfs and are therefore responsive to Ca + include spectrin of cell membranes, clathrin light chains from coated vesicles, the extracellular osteonectin of bones and teeth, ° and a birch pollen anhgen. 2 Another group of 17 or more small SlOO EF-hand proteins play a variety of other roles. One of these, which has a high affinity for Zn +, has been named psoriasin because of its 5-fold or greater... 

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