View source for 1vdi

[[Image:1vdi.gif|left|200px]]

<!--
The line below this paragraph, containing "STRUCTURE_1vdi", creates the "Structure Box" on the page.
You may change the PDB parameter (which sets the PDB file loaded into the applet) 
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
or leave the SCENE parameter empty for the default display.
-->
{{STRUCTURE_1vdi|  PDB=1vdi  |  SCENE=  }} 

'''Solution structure of actin-binding domain of troponin in Ca2+-free state'''


==Overview==
Troponin and tropomyosin on actin filaments constitute a Ca2+-sensitive switch that regulates the contraction of vertebrate striated muscle through a series of conformational changes within the actin-based thin filament. Troponin consists of three subunits: an inhibitory subunit (TnI), a Ca2+-binding subunit (TnC), and a tropomyosin-binding subunit (TnT). Ca2+-binding to TnC is believed to weaken interactions between troponin and actin, and triggers a large conformational change of the troponin complex. However, the atomic details of the actin-binding sites of troponin have not been determined. Ternary troponin complexes have been reconstituted from recombinant chicken skeletal TnI, TnC, and TnT2 (the C-terminal region of TnT), among which only TnI was uniformly labelled with 15N and/or 13C. By applying NMR spectroscopy, the solution structures of a "mobile" actin-binding domain (approximately 6.1 kDa) in the troponin ternary complex (approximately 52 kDa) were determined. The mobile domain appears to tumble independently of the core domain of troponin. Ca2+-induced changes in the chemical shift and line shape suggested that its tumbling was more restricted at high Ca2+ concentrations. The atomic details of interactions between actin and the mobile domain of troponin were defined by docking the mobile domain into the cryo-electron microscopy (cryo-EM) density map of thin filament at low [Ca2+]. This allowed the determination of the 3D position of residue 133 of TnI, which has been an important landmark to incorporate the available information. This enabled unique docking of the entire globular head region of troponin into the thin filament cryo-EM map at a low Ca2+ concentration. The resultant atomic model suggests that troponin interacted electrostatically with actin and caused the shift of tropomyosin to achieve muscle relaxation. An important feature is that the coiled-coil region of troponin pushed tropomyosin at a low Ca2+ concentration. Moreover, the relationship between myosin and the mobile domain on actin filaments suggests that the latter works as a fail-safe latch.

==About this Structure==
1VDI is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1VDI OCA]. 

==Reference==
Structural basis for Ca2+-regulated muscle relaxation at interaction sites of troponin with actin and tropomyosin., Murakami K, Yumoto F, Ohki SY, Yasunaga T, Tanokura M, Wakabayashi T, J Mol Biol. 2005 Sep 9;352(1):178-201. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/16061251 16061251]
[[Category: Gallus gallus]]
[[Category: Single protein]]
[[Category: Murakami, K.]]
[[Category: Ohki, S.]]
[[Category: Tanokura, M.]]
[[Category: Wakabayashi, T.]]
[[Category: Yasunaga, T.]]
[[Category: Yumoto, F.]]
[[Category: Actin]]
[[Category: Tropomyosin]]
[[Category: Troponin]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 12:24:39 2008''