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.

4z71

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 21:38, 15 October 2015

Crystal structure of inorganic pyrophosphatase from Mycobacterium tuberculosis in complex with Mg ions

Structural highlights

4z71 is a 3 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Related:	4z70, 4z72
Activity:	Inorganic diphosphatase, with EC number 3.6.1.1
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Publication Abstract from PubMed

Family I inorganic pyrophosphatases (PPiases) are ubiquitous enzymes that are critical for phosphate metabolism in all domains of life. The detailed catalytic mechanism of these enzymes, including the identity of the general base, is not fully understood. We determined a series of crystal structures of the PPiase from Mycobacterium tuberculosis (Mtb PPiase) bound to catalytic metals, inorganic pyrophosphate (PPi; the reaction substrate) and to one or two inorganic phosphate ions (Pi; the reaction product), ranging in resolution from 1.85 to 3.30A. These structures represent a set of major kinetic intermediates in the catalytic turnover pathway for this enzyme and suggest an order of association and dissociation of the divalent metals, the substrate and the two products during the catalytic turnover. The active site of Mtb PPiase exhibits significant structural differences from the well characterized Escherichia coli PPiase in the vicinity of the bound PPi substrate. Prompted by these differences, quantum mechanics/molecular mechanics (QM/MM) analysis yielded an atomic description of the hydrolysis step for Mtb PPiase and, unexpectedly, indicated that Asp89, rather than Asp54 that was proposed for E. coli PPiase, can abstract a proton from a water molecule to activate it for a nucleophilic attack on the PPi substrate. Mutagenesis studies of the key Asp residues of Mtb PPiase supported this mechanism. This combination of structural and computational analyses clarifies our understanding of the mechanism of family I PPiases and has potential utility for rational development of drugs targeting this enzyme.

Structural and computational dissection of the catalytic mechanism of the inorganic pyrophosphatase from Mycobacterium tuberculosis.,Pratt AC, Dewage SW, Pang AH, Biswas T, Barnard-Britson S, Cisneros GA, Tsodikov OV J Struct Biol. 2015 Aug 19. pii: S1047-8477(15)30048-4. doi:, 10.1016/j.jsb.2015.08.010. PMID:26296329^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Pratt AC, Dewage SW, Pang AH, Biswas T, Barnard-Britson S, Cisneros GA, Tsodikov OV. Structural and computational dissection of the catalytic mechanism of the inorganic pyrophosphatase from Mycobacterium tuberculosis. J Struct Biol. 2015 Aug 19. pii: S1047-8477(15)30048-4. doi:, 10.1016/j.jsb.2015.08.010. PMID:26296329 doi:http://dx.doi.org/10.1016/j.jsb.2015.08.010

1 Structural highlights
2 Publication Abstract from PubMed
3 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4z71"

@@ Line 6: / Line 6: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4z70|4z70]], [[4z72|4z72]]</td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Inorganic_diphosphatase Inorganic diphosphatase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.6.1.1 3.6.1.1] </span></td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4z71 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4z71 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4z71 RCSB], [http://www.ebi.ac.uk/pdbsum/4z71 PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4z71 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4z71 OCA], [http://pdbe.org/4z71 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4z71 RCSB], [http://www.ebi.ac.uk/pdbsum/4z71 PDBsum]</span></td></tr>
 </table>
 <div style="background-color:#fffaf0;">
@@ Line 16: / Line 16: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4z71" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4z71

From Proteopedia

Revision as of 21:38, 15 October 2015

Crystal structure of inorganic pyrophosphatase from Mycobacterium tuberculosis in complex with Mg ions

Structural highlights

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox