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- W2075176186 abstract "Previous low-angle X-ray diffraction studies of various vertebrate skeletal muscles have shown the presence of two rich layer-line patterns, one from the myosin heads and based on a 429 Å axial repeat, and one from actin filaments and based on a repeat of about 360–370 Å. In addition, meridional intensities have been seen from C-protein (MyBP-C; at about 440 Å and its higher orders) and troponin (at about 385 Å and its orders). Using preparations of intact, relaxed, bony fish fin muscles and the ID-02 low-angle X-ray camera at the ESRF with a 10 m camera length we have now seen numerous, hitherto unreported, sampled, X-ray layer-lines many of which do not fit onto the previously observed repeats and which require interpretation. The new reflections all fall on the normal (“vertical”) hexagonal lattice row-lines in the highly sampled, almost “crystalline”, low-angle diffraction X-ray patterns from bony fish muscle, indicating that they all arise from the muscle A-band. However, they do not fall on a single axial repeat. In direct confirmation of our previous analysis, some of these new reflections are explained by the interaction in resting muscle between the N-terminal ends of myosin-bound C-protein molecules with adjacent actin filaments, possibly through the Pro-Ala-rich region. Other newly observed reflections lie on a much longer repeat, but they are most easily interpreted in terms of the arrangement of troponin on the actin filaments. If this is so, then the implication is that the actin filaments and their troponin complexes are systematically arranged in the fish muscle A-band lattice relative to the myosin head positions, and that these newly observed X-ray reflections, when fully analysed, will report on the shape and distribution of troponin molecules in the resting muscle A-band. The less certain contributions of titin and nebulin to these new reflections have also been tested and are described. Many of the new reflections do not appear to come from these known structures. There must be structural features of the A-band that have not yet been described." @default.
- W2075176186 created "2016-06-24" @default.
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- W2075176186 date "2004-11-01" @default.
- W2075176186 modified "2023-10-15" @default.
- W2075176186 title "New X-ray Diffraction Observations on Vertebrate Muscle: Organisation of C-protein (MyBP-C) and Troponin and Evidence for Unknown Structures in the Vertebrate A-band" @default.
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- W2075176186 doi "https://doi.org/10.1016/j.jmb.2004.08.084" @default.
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