Sandbox 173: Difference between revisions

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====Formation of the Metarhodopsin II State====

Rhodopsin forms to Metarhodopsin II, the intermediate signaling state where interaction occurs with the G protein. This millisecond process is accompanied by movement in the helices, uptake of protons in the cytoplasm, and the breakage of the salt bridge between Glutamine 113 and the protonated Schiff base. The Schiff base ~~dhttp://www.proteopedia.org/wiki/index.php?title=Sandbox_173&action=editeprotonates~~ and the proton is transferred to the Glutamine 113 counterion, destabilizing the ground state <ref name="Article9"/>. As well, this Metarhodopsin II formation may be dependent on the protonation too of the conserved <scene name='Sandbox_173/Glu134_and_arg135/1'>Glutamine 134 that forms a salt bridge with Arginine 135</scene>, thus destabilizing the constraint on Arginine 135<ref name="Article9"/>.

Rhodopsin forms to Metarhodopsin II, the intermediate signaling state where interaction occurs with the G protein. This millisecond process is accompanied by movement in the helices, uptake of protons in the cytoplasm, and the breakage of the salt bridge between Glutamine 113 and the protonated Schiff base. The Schiff base deprotonates and the proton is transferred to the Glutamine 113 counterion, destabilizing the ground state <ref name="Article9"/>. As well, this Metarhodopsin II formation may be dependent on the protonation too of the conserved <scene name='Sandbox_173/Glu134_and_arg135/1'>Glutamine 134 that forms a salt bridge with Arginine 135</scene>, thus destabilizing the constraint on Arginine 135<ref name="Article9"/>.

There is positive enthalpy associated with the formation of Metarhodopsin II. This formation of the active state, also linked with the increase in entropy, is suggested to release the constraints in the helices and expose the cytoplasmic binding sites<ref name="Article9"/>. An important part of this process includes the 9-methyl group of retinal, which is suggested to provide a scaffold for proton transfers essential for the formation of the active state<ref name="Article9"/>.

Sandbox 173: Difference between revisions

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@@ Line 49: / Line 49: @@
 ====Formation of the Metarhodopsin II State====
-Rhodopsin forms to Metarhodopsin II, the intermediate signaling state where interaction occurs with the G protein. This millisecond process is accompanied by movement in the helices, uptake of protons in the cytoplasm, and the breakage of the salt bridge between Glutamine 113 and the protonated Schiff base. The Schiff base dhttp://www.proteopedia.org/wiki/index.php?title=Sandbox_173&action=editeprotonates and the proton is transferred to the Glutamine 113 counterion, destabilizing the ground state <ref name="Article9"/>. As well, this Metarhodopsin II formation may be dependent on the protonation too of the conserved <scene name='Sandbox_173/Glu134_and_arg135/1'>Glutamine 134 that forms a salt bridge with Arginine 135</scene>, thus destabilizing the constraint on Arginine 135<ref name="Article9"/>.
+Rhodopsin forms to Metarhodopsin II, the intermediate signaling state where interaction occurs with the G protein. This millisecond process is accompanied by movement in the helices, uptake of protons in the cytoplasm, and the breakage of the salt bridge between Glutamine 113 and the protonated Schiff base. The Schiff base deprotonates and the proton is transferred to the Glutamine 113 counterion, destabilizing the ground state <ref name="Article9"/>. As well, this Metarhodopsin II formation may be dependent on the protonation too of the conserved <scene name='Sandbox_173/Glu134_and_arg135/1'>Glutamine 134 that forms a salt bridge with Arginine 135</scene>, thus destabilizing the constraint on Arginine 135<ref name="Article9"/>.
 There is positive enthalpy associated with the formation of Metarhodopsin II. This formation of the active state, also linked with the increase in entropy, is suggested to release the constraints in the helices and expose the cytoplasmic binding sites<ref name="Article9"/>. An important part of this process includes the 9-methyl group of retinal, which is suggested to provide a scaffold for proton transfers essential for the formation of the active state<ref name="Article9"/>.