Sandbox Reserved 1627: Difference between revisions

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===Binding interactions===

[[Image:4 sites highlighted.png|thumb|right|260px|Figure 4: The presence of all four potential binding sides on the active insulin receptor: sites 1 and 1' (green) and sites 2, and 2'(red). [http://www.rcsb.org/structure/6sof PDB 6SOF]]]

A tripartite interaction occurs between three critical parts of the alpha subunits of the insulin receptor. One one subunit, the α-CT chain and the FnIII-1 domain region become in close proximity during the conformational change of the insulin receptor. This interaction involves the following residues: <scene name='83/832953/Alpha_ct_and_fniii-1/7'>ASP496, ARG498, and ASP499 on the FnIII-1 domain</scene> and the <scene name='83/832953/Alpha_ct_and_fniii-1/9'>LYS703, GLU706, and ASP707 on the α-CT domain</scene>. This duo then interacts with the leucine rich region, L1, that exists on the opposing alpha subunit of the dimer. The fact that the two alpha subunits are interacting displays a "cross linking" scenario where the domains of the heterodimer can intertwine with each other. The tripartite interaction between the α-CT chain, FnIII-1 domain, and the L1 region is important because it allows for a strong and stable interaction between two subunits of the insulin receptor that maintains the T-shape activation state for the rest of the downstream signaling to occur.

A <scene name='83/832953/Tripartite_interaction/1'>tripartite interaction</scene> occurs between three critical parts of the alpha subunits of the insulin receptor. One one subunit, the α-CT chain and the FnIII-1 domain region become in close proximity during the conformational change of the insulin receptor. This interaction involves the following residues: <scene name='83/832953/Alpha_ct_and_fniii-1/7'>ASP496, ARG498, and ASP499 on the FnIII-1 domain</scene> and the <scene name='83/832953/Alpha_ct_and_fniii-1/9'>LYS703, GLU706, and ASP707 on the α-CT domain</scene>. This duo then interacts with the leucine rich region, L1, that exists on the opposing alpha subunit of the dimer. The fact that the two alpha subunits are interacting displays a "cross linking" scenario where the domains of the heterodimer can intertwine with each other. The tripartite interaction between the α-CT chain, FnIII-1 domain, and the L1 region is important because it allows for a strong and stable interaction between two subunits of the insulin receptor that maintains the T-shape activation state for the rest of the downstream signaling to occur.

For insulin binding to induce the activation of the receptor and change its conformation to the active T state, binding at sites 1 and 1', as well as one insulin to either binding site 2 or 2', is required. <ref> DOI 10.7554/eLife.48630 </ref>. Although interactions at all four binding sites are highly hydrophobic, the ligand binding interactions at sites 1 and 1' are different than at sites 2 and 2'. Sites 1 and 1' are signified by interactions between <scene name='83/832953/Sites_1_and_1_prime_location/14'>PRO495, PHE497, ARG498</scene> residues from the FnIII-1 domain and particular residues on the insulin ligand, such as HIS5. They also have significant disulfide linkages that help maintain a compact binging site. At sites 2 and 2' the FnIII-1 region has <scene name='83/832953/Sites_2_and_2_prime_location/10'>both basic residues-ARG479, LYS484, ARG488, ARG554- and hydrophobic residues- LEU486, LEU552, and PRO537-</scene> interacting with numerous residues on the surface of the insulin ligand.

Sandbox Reserved 1627: Difference between revisions

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@@ Line 26: / Line 26: @@
 ===Binding interactions===
 [[Image:4 sites highlighted.png|thumb|right|260px|Figure 4: The presence of all four potential binding sides on the active insulin receptor: sites 1 and 1' (green) and sites 2, and 2'(red). [http://www.rcsb.org/structure/6sof PDB 6SOF]]]
-A tripartite interaction occurs between three critical parts of the alpha subunits of the insulin receptor. One one subunit, the α-CT chain and the FnIII-1 domain region become in close proximity during the conformational change of the insulin receptor. This interaction involves the following residues: <scene name='83/832953/Alpha_ct_and_fniii-1/7'>ASP496, ARG498, and ASP499 on the FnIII-1 domain</scene> and the <scene name='83/832953/Alpha_ct_and_fniii-1/9'>LYS703, GLU706, and ASP707 on the α-CT domain</scene>. This duo then interacts with the leucine rich region, L1, that exists on the opposing alpha subunit of the dimer. The fact that the two alpha subunits are interacting displays a "cross linking" scenario where the domains of the heterodimer can intertwine with each other. The tripartite interaction between the α-CT chain, FnIII-1 domain, and the L1 region is important because it allows for a strong and stable interaction between two subunits of the insulin receptor that maintains the T-shape activation state for the rest of the downstream signaling to occur.
+A <scene name='83/832953/Tripartite_interaction/1'>tripartite interaction</scene> occurs between three critical parts of the alpha subunits of the insulin receptor. One one subunit, the α-CT chain and the FnIII-1 domain region become in close proximity during the conformational change of the insulin receptor. This interaction involves the following residues: <scene name='83/832953/Alpha_ct_and_fniii-1/7'>ASP496, ARG498, and ASP499 on the FnIII-1 domain</scene> and the <scene name='83/832953/Alpha_ct_and_fniii-1/9'>LYS703, GLU706, and ASP707 on the α-CT domain</scene>. This duo then interacts with the leucine rich region, L1, that exists on the opposing alpha subunit of the dimer. The fact that the two alpha subunits are interacting displays a "cross linking" scenario where the domains of the heterodimer can intertwine with each other. The tripartite interaction between the α-CT chain, FnIII-1 domain, and the L1 region is important because it allows for a strong and stable interaction between two subunits of the insulin receptor that maintains the T-shape activation state for the rest of the downstream signaling to occur.
 For insulin binding to induce the activation of the receptor and change its conformation to the active T state, binding at sites 1 and 1', as well as one insulin to either binding site 2 or 2', is required. <ref> DOI 10.7554/eLife.48630 </ref>. Although interactions at all four binding sites are highly hydrophobic, the ligand binding interactions at sites 1 and 1' are different than at sites 2 and 2'. Sites 1 and 1' are signified by interactions between <scene name='83/832953/Sites_1_and_1_prime_location/14'>PRO495, PHE497, ARG498</scene> residues from the FnIII-1 domain and particular residues on the insulin ligand, such as HIS5. They also have significant disulfide linkages that help maintain a compact binging site. At sites 2 and 2' the FnIII-1 region has <scene name='83/832953/Sites_2_and_2_prime_location/10'>both basic residues-ARG479, LYS484, ARG488, ARG554- and hydrophobic residues- LEU486, LEU552, and PRO537-</scene> interacting with numerous residues on the surface of the insulin ligand.