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In the low calcium environment present during diastole (~100 nM), [26] tropomyosin is anchored into the "blocked" position along the actin thin filament through the binding of the troponin I inhibitory (cTnI 128-147) and C-terminal (cTnI 160-209) regions. [27] [28] This prevents actin-myosin cross-bridging and effectively shuts off muscle ...
Troponin C (red) binds Ca2+, which stabilizes the activated state, where troponin I (yellow) is no longer bound to actin. Troponin T (blue) anchors the complex on tropomyosin. Troponin is found in both skeletal muscle and cardiac muscle , but the specific versions of troponin differ between types of muscle.
The thin filament of smooth muscle is made of actin, tropomyosin, caldesmon, and calmodulin. Within this type of muscle, caldesmon and calmodulin control the tropomyosin-mediated transition between on and off activity states. Caldesmon binds to actin, tropomyosin, calmodulin, and myosin, of which its interactions with actin are most important.
Troponin C is a protein which is part of the troponin complex. It contains four calcium-binding EF hands , although different isoforms may have fewer than four functional calcium-binding subdomains. It is a component of thin filaments , along with actin and tropomyosin .
21925 Ensembl ENSG00000101470 ENSMUSG00000017300 UniProt P02585 P20801 RefSeq (mRNA) NM_003279 NM_009394 RefSeq (protein) NP_003270 NP_033420 Location (UCSC) Chr 20: 45.82 – 45.83 Mb Chr 2: 164.62 – 164.62 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Troponin C, skeletal muscle is a protein that in humans is encoded by the TNNC2 gene. Troponin (Tn), is a key protein complex in ...
Blue = troponin C; green = troponic I; magenta = troponin T. [1] Troponin. Troponin I is a cardiac and skeletal muscle protein family. It is a part of the troponin protein complex, where it binds to actin in thin myofilaments to hold the actin-tropomyosin complex in place. Troponin I prevents myosin from binding to actin in relaxed muscle. When ...
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