This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.
Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.
1og1
From Proteopedia
| Line 24: | Line 24: | ||
[[Category: transferase]] | [[Category: transferase]] | ||
| - | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Oct 30 | + | ''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Oct 30 15:53:03 2007'' |
Revision as of 13:48, 30 October 2007
|
CRYSTAL STRUCTURE OF THE EUCARYOTIC MONO-ADP-RIBOSYLTRANSFERASE ART2.2 IN COMPLEX WITH TAD
Overview
The structures of beta-methylenethiazole-4-carboxamide adenine, dinucleotide (TAD), NAD(+), and NADH as bound to, ecto-ADP-ribosyltransferase 2.2 from rat and to its mutants E189I and, E189A, respectively, have been established. The positions and, conformations of NAD(+) and its analogues agree in general with those in, other ADP-ribosyltransferases. The kinetic constants for NAD(+) hydrolysis, were determined by RP-HPLC. The specific activity amounts to 26 units/mg, which is 6000-fold higher than a previously reported rate and 500-fold, higher than the hydrolysis rates of other ADP-ribosyltransferases, confirming that hydrolysis is the major function of this enzyme. On the, basis of structures and mutant activities, a catalytic mechanism is, proposed. The known auto-ADP-ribosylation of ... [(full description)]
About this Structure
1OG1 is a [Single protein] structure of sequence from [Rattus norvegicus] with TAD as [ligand]. Active as [NAD(P)(+)--protein-arginine ADP-ribosyltransferase], with EC number [2.4.2.31]. Structure known Active Site: TAD. Full crystallographic information is available from [OCA].
Reference
Substrate binding and catalysis of ecto-ADP-ribosyltransferase 2.2 from rat., Ritter H, Koch-Nolte F, Marquez VE, Schulz GE, Biochemistry. 2003 Sep 2;42(34):10155-62. PMID:12939142
Page seeded by OCA on Tue Oct 30 15:53:03 2007
