Proteopedia:Main page develop: Difference between revisions

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<div style="font-size:130%; line-height:2.0em"><span style="color:green" align="center">Green</span> links change the 3D image!</div>
<div style="font-size:130%; line-height:2.0em"><span style="color:green" align="center">Green</span> links change the 3D image!</div>
<div style="font-size:200%; line-height:2.0em">[[1eve]]</div>
<div style="font-size:200%; line-height:2.0em">[[2q66]] - Poly(A) polymerase</div>
The anti-Alzheimer's drug E2020 (marketed as Aricept&reg;) is an inhibitor that binds acetylcholinesterase (AChE) with high affinity. The X-ray structure of the E2020-AChE (AChE from ''Torpedo california'') complex shows that E2020 has a '''<scene name='1eve/E2020_close_up_with_84_279/12'>unique orientation</scene>''' along the active-site gorge, extending from the anionic subsite ('''<scene name='1eve/E2020_close_up_with_84lbld/6'>W84</scene>''') of the active site, at the bottom, to the peripheral anionic site ('''<scene name='1eve/E2020_close_up_with_84_279lbld/4'>near W279</scene>'''), at the top, via aromatic stacking interactions with conserved aromatic acid residues. E2020 does not, however, interact directly with either the catalytic triad or the 'oxyanion hole' but only '''<scene name='1eve/E20_interactionshown/7'>indirectly via solvent molecules</scene>'''. [[1eve|Read more...]]
Poly(A) polymerase binds specifically to ATP and adds it the end of a messenger RNA chain. This structure contains an oligo(A) polynucleotide with five nucleotides, an ATP molecule, and a magnesium ion. … In the <scene name='2q66/2q66_summary/1'>summary picture</scene>, the enzyme is in blue backbone representation, the RNA chain is in yellow, the ATP is in red, the magnesium is in green, and ALA154 is in magenta. Several mechanisms are used to achieve the specificity for ATP. The magnesium is coordinated by <scene name='2q66/2q66_asp/2'>ASP100 and ASP102</scene>, and the magnesium coordinates with the phosphates of ATP, positioning the nucleotide in the active site. The adenine base is sandwiched between the <scene name='2q66/2q66_stacking/2'>terminal base of the RNA (in yellow) and VAL234 (in cyan)</scene>. [[2q66|Read more...]]
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