Tropomyosin

Tropomyosin (TPM) has a 4-helix coiled dimer structure. It regulates the binding of myosin thus regulating muscle contraction. In its locked conformation it binds troponin T (TnnT) and prevents the binding of myosin to actin. When Ca++ ions bind to TnnT, the TPM assumes an open conformation and myosin can bind to actin. The images at the top and at the right correspond to one representative TPM structure, i.e. Tropomyosin from pig (1c1g). You can enlarge the image at the right for clarity.

File:1c1g.png

Crystal Structure of Pig Tropomyosin, 1c1g

spinqualitylabelsall models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D load='1c1g' size='300' frame='false' scene='Tropomyosin/Cv/5'
Tropomyosin from pig, 1c1g
Structural annotation: Resources: InterPro : Ipr000533 Pfam : PF00261 SCOP : d1c1ga_, d1c1gb_, d1c1gc_, d1c1gd_ UniProt : P42639
Functional annotation: Cellular component: cytoskeleton cytoplasm Molecular function: actin binding
Evolutionary conservation: Toggle Conservation Colors: Rows = identical sequences: Further Information: Caveats, Explanation, Complete Results at ConSurfDB
Resources:	FirstGlance, OCA, RCSB, PDBsum
Coordinates:	save as pdb, mmCIF, xml

3D Structures of Tropomyosin

3mtu, 3mud – cTPM alpha-1 – chicken
1ic2 - cTPM alpha-1 (mutant)
2w49 – cTnnC+cTnnT+cTnnI+cTPM alpha-1+cActin
2z5h – yTPM alpha-1 N-terminal+C-terminal+GNC4 leucine zipper+TnnT – yeast
2z5i - yTPM alpha-1 N-terminal+C-terminal+GNC4 leucine zipper
2efr, 2efs, 2d3e - rTPM alpha-1 C-terminal+GNC4 leucine zipper – rabbit
1kql - TPM alpha-1 C-terminal+GNC4 leucine zipper - rat
2b9c – TPM mid region – rat
1c1g – TPM – pig
2tma – TPM - model

Proteopedia Page Contributors and Editors (what is this?)

Gregory Hoeprich, Alexander Berchansky, David Canner, Joel L. Sussman, Jaime Prilusky, Michal Harel