E.Radzio Andzelm, J Lew, S Taylor  Structure 

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Bound to activate: conformational consequences of cyclin binding to CDK2  E.Radzio Andzelm, J Lew, S Taylor  Structure  Volume 3, Issue 11, Pages 1135-1141 (November 1995) DOI: 10.1016/S0969-2126(01)00249-0

Figure 1 A comparison of CDK2 with the catalytic subunit of cAMP-dependent protein kinase (cAPK). The general domain structure of the two proteins is compared, with the small ATP binding lobe in purple and the large lobe in pink. The residues that are conserved throughout the protein-kinase family are indicated. Activating phosphorylation sites are indicated as green circles and inhibitory sites are pink circles. The insert in CDK2 is shown in yellow. Myr refers to the myristylation site. The conserved GXGXXG motif corresponds to a glycine-rich loop between β-strands 1 and 2. Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)

Figure 2 General features of the CDK2 structure. (a) The Cα backbone of CDK2, with the positions of the invariant residues shown in Figure 1 highlighted as yellow, and white (glycine residues in the glycine-rich loop) spheres. Regions that are ordered differently from the catalytic subunit of cAPK when the two structures are superimposed, that is, the activation segment in the large lobe and the polypeptide chain linking β-strand 3 with the helix in the small lobe, are indicated in white. ATP and the conserved PSTAIRE segment in the helix of the small domain are in yellow. The insert is in red. The activating phosphorylation site, Thr160, is shown as a green sphere and the inhibitory site at Tyr15 is in red. (b) Cα backbone trace with each α-carbon color coded with respect to its B factor. The scale for the color coding is also indicated (c) Eight of the conserved residues (yellow spheres in (a)) in CDK2 and the ternary complex of the catalytic subunit of cAPK. The two structures were superimposed using the large lobe; only the Cαs are shown (spheres). The numbering corresponds to residues in cAPK with the exception of E51 in CDK2 which is highlighted in red. The corresponding numbers for CDK2 are indicated in Figure 1. In the circle is the triad that is important for docking the phosphates of MgATP. The three conserved glycines are not included as this glycine-rich loop is rather mobile. All figures were generated using the INSIGHT II program (Biosym Technologies, Inc.). Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)

Figure 3 Structure of the CDK2–cyclin A complex. (a) The structure of CDK2 is indicated in purple and the two domains of cyclin A are shown in turquoise and blue. The interacting surfaces are highlighted as follows. In CDK2, the activation loop, that includes the T loop and the PSTAIRE helix, is white. Hydrophobic residues are pink; charged residues are yellow. Specific residues contributing to the interface between CDK2 and cyclin A are shown as well as some of the key residues in CDK2 (Glu38 and Glu40) and cyclin (Leu255, Asp240 and Arg211) that were thought previously to be important for CDK2–cyclin interaction. The phosphorylation site. Thr160, is shown in red. (b) A close up view of the interaction site. Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)

Figure 3 Structure of the CDK2–cyclin A complex. (a) The structure of CDK2 is indicated in purple and the two domains of cyclin A are shown in turquoise and blue. The interacting surfaces are highlighted as follows. In CDK2, the activation loop, that includes the T loop and the PSTAIRE helix, is white. Hydrophobic residues are pink; charged residues are yellow. Specific residues contributing to the interface between CDK2 and cyclin A are shown as well as some of the key residues in CDK2 (Glu38 and Glu40) and cyclin (Leu255, Asp240 and Arg211) that were thought previously to be important for CDK2–cyclin interaction. The phosphorylation site. Thr160, is shown in red. (b) A close up view of the interaction site. Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)

Figure 4 Conformational changes in the small lobe. (a) The backbones of CDK2 (turquoise) and CDK2–cyclin A (purple) are superimposed. The side chains of Ile49, Arg50, Glu51 and Lys33 for CDK2–cyclin A are in yellow and for CDK2 alone are in red. The backbone of Lys33 in the complex is also shown in yellow to mark the position of this residue. (b) The side chains of Glu51, Lys33 and Asp145 are shown with three α-carbons indicated as spheres. cAPK is in turquoise; CDK2 is in pink, with the position of Glu51 highlighted in red; the CDK2–cyclin A complex side chains are in yellow. Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)

Figure 4 Conformational changes in the small lobe. (a) The backbones of CDK2 (turquoise) and CDK2–cyclin A (purple) are superimposed. The side chains of Ile49, Arg50, Glu51 and Lys33 for CDK2–cyclin A are in yellow and for CDK2 alone are in red. The backbone of Lys33 in the complex is also shown in yellow to mark the position of this residue. (b) The side chains of Glu51, Lys33 and Asp145 are shown with three α-carbons indicated as spheres. cAPK is in turquoise; CDK2 is in pink, with the position of Glu51 highlighted in red; the CDK2–cyclin A complex side chains are in yellow. Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)

Figure 5 Comparison of the activation segments in CDK2, cAPK, and the CDK2–cyclin complex. (a) The activation segments flanked by the conserved residues corresponding to Asp184 and Glu208 in cAPK are shown for CDK2 (cyan), cAPK (blue), and the CDK2–cyclin A complex (purple). The large lobes of these structures were superimposed, but only the segments between the equivalent of Asp184 and Glu208 in cAPK are shown. The α-carbons of the phosphorylation sites and the conserved aspartates and glutamates that flank the activation loops, are shown as spheres. (b) The B factors for each of these loops. The color coding for the B factors is the same as in Figure 2. Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)

Figure 5 Comparison of the activation segments in CDK2, cAPK, and the CDK2–cyclin complex. (a) The activation segments flanked by the conserved residues corresponding to Asp184 and Glu208 in cAPK are shown for CDK2 (cyan), cAPK (blue), and the CDK2–cyclin A complex (purple). The large lobes of these structures were superimposed, but only the segments between the equivalent of Asp184 and Glu208 in cAPK are shown. The α-carbons of the phosphorylation sites and the conserved aspartates and glutamates that flank the activation loops, are shown as spheres. (b) The B factors for each of these loops. The color coding for the B factors is the same as in Figure 2. Structure 1995 3, 1135-1141DOI: (10.1016/S0969-2126(01)00249-0)