1a26: Difference between revisions
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New page: left|200px<br /><applet load="1a26" size="450" color="white" frame="true" align="right" spinBox="true" caption="1a26, resolution 2.25Å" /> '''THE CATALYTIC FRAGME... |
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[[Image:1a26.jpg|left|200px]]<br /><applet load="1a26" size=" | [[Image:1a26.jpg|left|200px]]<br /><applet load="1a26" size="350" color="white" frame="true" align="right" spinBox="true" | ||
caption="1a26, resolution 2.25Å" /> | caption="1a26, resolution 2.25Å" /> | ||
'''THE CATALYTIC FRAGMENT OF POLY(ADP-RIBOSE) POLYMERASE COMPLEXED WITH CARBA-NAD'''<br /> | '''THE CATALYTIC FRAGMENT OF POLY(ADP-RIBOSE) POLYMERASE COMPLEXED WITH CARBA-NAD'''<br /> | ||
==Overview== | ==Overview== | ||
The binding site for the acceptor substrate poly(ADP-ribose) in the | The binding site for the acceptor substrate poly(ADP-ribose) in the elongation reaction of the ADP-ribosyl transferase poly(ADP-ribose) polymerase (PARP) was detected by cocrystallizing the enzyme with an NAD+ analogue. The site was confirmed by mutagenesis studies. In conjunction with the binding site of the donor NAD+, the bound acceptor reveals the geometry of the elongation reaction. It shows in particular that the strictly conserved glutamate residue of all ADP-ribosylating enzymes (Glu988 of PARP) facilitates the reaction by polarizing both, donor and acceptor. Moreover, the binding properties of the acceptor site suggest a mechanism for the branching reaction, that also explains the dual specificity of this transferase for elongation and branching, which is unique among polymer-forming enzymes. | ||
==About this Structure== | ==About this Structure== | ||
1A26 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus] with CNA as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/NAD(+)_ADP-ribosyltransferase NAD(+) ADP-ribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.30 2.4.2.30] Full crystallographic information is available from [http:// | 1A26 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Gallus_gallus Gallus gallus] with <scene name='pdbligand=CNA:'>CNA</scene> as [http://en.wikipedia.org/wiki/ligand ligand]. Active as [http://en.wikipedia.org/wiki/NAD(+)_ADP-ribosyltransferase NAD(+) ADP-ribosyltransferase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.4.2.30 2.4.2.30] Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1A26 OCA]. | ||
==Reference== | ==Reference== | ||
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[[Category: Single protein]] | [[Category: Single protein]] | ||
[[Category: Ruf, A.]] | [[Category: Ruf, A.]] | ||
[[Category: Schulz, G | [[Category: Schulz, G E.]] | ||
[[Category: CNA]] | [[Category: CNA]] | ||
[[Category: glycosyltransferase]] | [[Category: glycosyltransferase]] | ||
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[[Category: transferase]] | [[Category: transferase]] | ||
''Page seeded by [http:// | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 11:40:01 2008'' | ||
