2h1k

From Proteopedia

(Difference between revisions)

Revision as of 06:36, 27 June 2018

Crystal structure of the Pdx1 homeodomain in complex with DNA

Structural highlights

2h1k is a 6 chain structure with sequence from Golden hamster. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	IPF1, PDX1 (Golden hamster)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[PDX1_MESAU] Activates insulin and somatostatin gene transcription. Key regulator of islet peptide hormone expression but also responsible for the development of the pancreas, most probably by determining maturation and differentiation of common pancreatic precursor cells in the developing gut. As part of a PDX1:PBX1b:MEIS2b complex in pancreatic acinar cells is involved in the transcriptional activation of the ELA1 enhancer; the complex binds to the enhancer B element and cooperates with the transcription factor 1 complex (PTF1) bound to the enhancer A element. Binds the DNA sequence 5'-CC[CT]TAATGGG-3' (By similarity).

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Pancreatic and duodenal homeobox 1 (Pdx1) is a homeodomain transcription factor belonging to the ParaHox family. Pdx1 plays an essential role in pancreatic endocrine and exocrine cell development and maintenance of adult islet beta-cell function. Mutations in the human pdx1 gene are linked to an early onset form of non-insulin-dependent diabetes mellitus, MODY-4. We demonstrate that the homeodomain reproduces the binding specificity of the full-length protein. We report the 2.4 A resolution crystal structure of the homeodomain bound to a target DNA. The two Pdx1/DNA complexes in the asymmetric unit display conformational differences: in the DNA curvature, the orientation of the homeodomain in the major groove, and the order of the N-terminal arm. Comparing the two complexes indicates invariant protein-DNA contacts, and variant contacts that are unique to each binding orientation. An induced fit model is proposed that depends on the DNA conformation and provides a mechanism for nonlocal contributions to binding specificity.

Structural basis for induced fit mechanisms in DNA recognition by the Pdx1 homeodomain.,Longo A, Guanga GP, Rose RB Biochemistry. 2007 Mar 20;46(11):2948-57. Epub 2007 Feb 23. PMID:17315980^[1]

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

References

↑ Longo A, Guanga GP, Rose RB. Structural basis for induced fit mechanisms in DNA recognition by the Pdx1 homeodomain. Biochemistry. 2007 Mar 20;46(11):2948-57. Epub 2007 Feb 23. PMID:17315980 doi:10.1021/bi060969l

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2h1k"

@@ Line 1: / Line 1: @@
 ==Crystal structure of the Pdx1 homeodomain in complex with DNA==
 <StructureSection load='2h1k' size='340' side='right' caption='[[2h1k]], [[Resolution|resolution]] 2.42&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[2h1k]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Golden_hamster Golden hamster]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2H1K OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2H1K FirstGlance]. <br>
 </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">IPF1, PDX1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10036 Golden hamster])</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=2h1k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2h1k OCA], [http://pdbe.org/2h1k PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2h1k RCSB], [http://www.ebi.ac.uk/pdbsum/2h1k 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=2h1k FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2h1k OCA], [http://pdbe.org/2h1k PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2h1k RCSB], [http://www.ebi.ac.uk/pdbsum/2h1k PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2h1k ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 12: / Line 13: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/h1/2h1k_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/h1/2h1k_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

2h1k

From Proteopedia

Revision as of 06:36, 27 June 2018

Crystal structure of the Pdx1 homeodomain in complex with DNA

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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