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.


1pyq

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Line 1: Line 1:
-
[[Image:1pyq.jpg|left|200px]]
+
{{Seed}}
 +
[[Image:1pyq.png|left|200px]]
<!--
<!--
Line 9: Line 10:
{{STRUCTURE_1pyq| PDB=1pyq | SCENE= }}
{{STRUCTURE_1pyq| PDB=1pyq | SCENE= }}
-
'''Unprocessed Aspartate Decarboxylase Mutant, with Alanine inserted at position 24'''
+
===Unprocessed Aspartate Decarboxylase Mutant, with Alanine inserted at position 24===
-
==Overview==
+
<!--
-
Aspartate decarboxylase, which is translated as a pro-protein, undergoes intramolecular self-cleavage at Gly24-Ser25. We have determined the crystal structures of an unprocessed native precursor, in addition to Ala24 insertion, Ala26 insertion and Gly24--&gt;Ser, His11--&gt;Ala, Ser25--&gt;Ala, Ser25--&gt;Cys and Ser25--&gt;Thr mutants. Comparative analyses of the cleavage site reveal specific conformational constraints that govern self-processing and demonstrate that considerable rearrangement must occur. We suggest that Thr57 Ogamma and a water molecule form an 'oxyanion hole' that likely stabilizes the proposed oxyoxazolidine intermediate. Thr57 and this water molecule are probable catalytic residues able to support acid-base catalysis. The conformational freedom in the loop preceding the cleavage site appears to play a determining role in the reaction. The molecular mechanism of self-processing, presented here, emphasizes the importance of stabilization of the oxyoxazolidine intermediate. Comparison of the structural features shows significant similarity to those in other self-processing systems, and suggests that models of the cleavage site of such enzymes based on Ser--&gt;Ala or Ser--&gt;Thr mutants alone may lead to erroneous interpretations of the mechanism.
+
The line below this paragraph, {{ABSTRACT_PUBMED_14633979}}, adds the Publication Abstract to the page
 +
(as it appears on PubMed at http://www.pubmed.gov), where 14633979 is the PubMed ID number.
 +
-->
 +
{{ABSTRACT_PUBMED_14633979}}
==About this Structure==
==About this Structure==
Line 37: Line 41:
[[Category: Autoprocessing]]
[[Category: Autoprocessing]]
[[Category: Pyruvoyl]]
[[Category: Pyruvoyl]]
-
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 05:39:15 2008''
+
 
 +
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 09:32:45 2008''

Revision as of 06:32, 29 July 2008

Image:1pyq.png

Template:STRUCTURE 1pyq

Unprocessed Aspartate Decarboxylase Mutant, with Alanine inserted at position 24

Template:ABSTRACT PUBMED 14633979

About this Structure

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

Reference

Structural constraints on protein self-processing in L-aspartate-alpha-decarboxylase., Schmitzberger F, Kilkenny ML, Lobley CM, Webb ME, Vinkovic M, Matak-Vinkovic D, Witty M, Chirgadze DY, Smith AG, Abell C, Blundell TL, EMBO J. 2003 Dec 1;22(23):6193-204. PMID:14633979

Page seeded by OCA on Tue Jul 29 09:32:45 2008

Proteopedia Page Contributors and Editors (what is this?)

OCA

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