1ru2

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Line 1: Line 1:
[[Image:1ru2.jpg|left|200px]]
[[Image:1ru2.jpg|left|200px]]
-
{{Structure
+
<!--
-
|PDB= 1ru2 |SIZE=350|CAPTION= <scene name='initialview01'>1ru2</scene>, resolution 1.48&Aring;
+
The line below this paragraph, containing "STRUCTURE_1ru2", creates the "Structure Box" on the page.
-
|SITE=
+
You may change the PDB parameter (which sets the PDB file loaded into the applet)
-
|LIGAND= <scene name='pdbligand=APC:DIPHOSPHOMETHYLPHOSPHONIC+ACID+ADENOSYL+ESTER'>APC</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=HHR:6-HYDROXYMETHYLPTERIN'>HHR</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>
+
or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
-
|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/2-amino-4-hydroxy-6-hydroxymethyldihydropteridine_diphosphokinase 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.6.3 2.7.6.3] </span>
+
or leave the SCENE parameter empty for the default display.
-
|GENE= FOLK, B0142 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
+
-->
-
|DOMAIN=
+
{{STRUCTURE_1ru2| PDB=1ru2 | SCENE= }}
-
|RELATEDENTRY=[[1hka|1HKA]], [[1eqm|1EQM]], [[1eq0|1EQ0]], [[1q0n|1Q0N]], [[1ex8|1EX8]], [[1cbk|1CBK]], [[1dy3|1DY3]], [[1f9y|1F9Y]], [[1f9h|1F9H]], [[1g4c|1G4C]], [[1hq2|1HQ2]], [[1hq9|1HQ9]], [[1im6|1IM6]], [[1kbr|1KBR]], [[1rao|1RAO]], [[1rb0|1RB0]], [[1rtz|1RTZ]], [[1ru1|1RU1]]
+
-
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ru2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ru2 OCA], [http://www.ebi.ac.uk/pdbsum/1ru2 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1ru2 RCSB]</span>
+
-
}}
+
'''CRYSTAL STRUCTURE OF A TERNARY COMPLEX OF E.COLI HPPK(V83G/DEL84-89) WITH MGAMPCPP AND 6-HYDROXYMETHYLPTERIN AT 1.48 ANGSTROM RESOLUTION (ORTHORHOMBIC FORM)'''
'''CRYSTAL STRUCTURE OF A TERNARY COMPLEX OF E.COLI HPPK(V83G/DEL84-89) WITH MGAMPCPP AND 6-HYDROXYMETHYLPTERIN AT 1.48 ANGSTROM RESOLUTION (ORTHORHOMBIC FORM)'''
Line 30: Line 27:
[[Category: 6-hydroxymethyl-7,8-dihydropterin]]
[[Category: 6-hydroxymethyl-7,8-dihydropterin]]
[[Category: 6-hydroxymethylpterin]]
[[Category: 6-hydroxymethylpterin]]
-
[[Category: antimicrobial agent]]
+
[[Category: Antimicrobial agent]]
-
[[Category: deletion mutant]]
+
[[Category: Deletion mutant]]
-
[[Category: drug design]]
+
[[Category: Drug design]]
-
[[Category: folate]]
+
[[Category: Folate]]
-
[[Category: hppk]]
+
[[Category: Hppk]]
-
[[Category: pyrophosphokinase]]
+
[[Category: Pyrophosphokinase]]
-
[[Category: pyrophosphoryl transfer]]
+
[[Category: Pyrophosphoryl transfer]]
-
[[Category: x-ray crystallography]]
+
[[Category: X-ray crystallography]]
-
 
+
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 07:54:39 2008''
-
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 23:32:56 2008''
+

Revision as of 04:54, 3 May 2008

Image:1ru2.jpg

Template:STRUCTURE 1ru2

CRYSTAL STRUCTURE OF A TERNARY COMPLEX OF E.COLI HPPK(V83G/DEL84-89) WITH MGAMPCPP AND 6-HYDROXYMETHYLPTERIN AT 1.48 ANGSTROM RESOLUTION (ORTHORHOMBIC FORM)


Overview

6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) catalyzes the transfer of pyrophosphoryl group from ATP to 6-hydroxymethyl-7,8-dihydropterin (HP) following an ordered bi-bi mechanism with ATP as the first substrate. The rate-limiting step of the reaction is product release, and the complete active center is assembled and sealed only upon the binding of both ATP and HP. The assembly of the active center involves large conformational changes in three catalytic loops, among which loop 3 undergoes the most dramatic and unusual changes. To investigate the roles of loop 3 in catalysis, we have made a deletion mutant, which has been investigated by biochemical and X-ray crystallographic analysis. The biochemical data showed that the deletion mutation does not have significant effects on the dissociation constants or the rate constants for the binding of the first substrate MgATP or its analogues. The dissociation constant of HP for the mutant increases by a factor of approximately 100, which is due to a large increase in the dissociation rate constant. The deletion mutation causes a shift of the rate-limiting step in the reaction and a decrease in the rate constant for the chemical step by a factor of approximately 1.1 x 10(5). The crystal structures revealed that the deletion mutation does not affect protein folding, but the catalytic center of the mutant is not fully assembled even upon the formation of the ternary complex and is not properly sealed. The results together suggest that loop 3 is dispensable for the folding of the protein and the binding of the first substrate MgATP, but is required for the assembling and sealing of the active center. The loop plays an important role in the stabilization of the ternary complex and is critical for catalysis.

About this Structure

1RU2 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Essential roles of a dynamic loop in the catalysis of 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase., Blaszczyk J, Li Y, Wu Y, Shi G, Ji X, Yan H, Biochemistry. 2004 Feb 17;43(6):1469-77. PMID:14769023 Page seeded by OCA on Sat May 3 07:54:39 2008

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1ru2"
Personal tools