2v3n

From Proteopedia

(Difference between revisions)

Revision as of 09:02, 12 September 2018

Crystallographic analysis of upper axial ligand substitutions in cobalamin bound to transcobalamin

Structural highlights

2v3n is a 1 chain structure with sequence from Bovin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, ,
Related:	2bb6, 2v3p, 2bbc
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[TCO2_BOVIN] Primary vitamin B12-binding and transport protein. Delivers cobalamin to cells.

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

Cobalamin (Cbl, vitamin B12) is an essential micronutrient that is synthesized only by bacteria. Mammals have developed a complex system for internalization of this vitamin from the diet. Three binding proteins (haptocorrin, intrinsic factor, transcobalamin (TC)) and several specific cell surface receptors are involved in the process of intestinal absorption, plasma transport and cellular uptake. The recent literature on the binding proteins is briefly reviewed. A structural study is presented addressing a unique feature of TC among the three proteins, i.e., the displacement of the weak Co(III)-ligand H2O at the upper (or beta) axial side of H2O-Cbl by a histidine side chain. We have investigated crystallographically the beta-ligand exchange on Cbl bound to TC by crystallization of bovine holo-TC in the presence of either cyanide or sulfite. The resulting electron density maps show that the histidine side chain has been displaced by an exogenous ligand CN(-) or SO(3)(-2)to a lower extent than expected based on their higher affinity for Co and excess concentration with respect to histidine. This may reflect either reduced affinities of CN(-) and SO(3)(-2)or the advantageous binding of the protein-integrated His-residue when competing for the beta-site of Cbl bound to TC. The loop hosting the histidine residue appears more flexible after disruption of the coordination bond His-Cbl but no other differences are observed in the overall structure of holo-TC. These structural results are discussed in relation to a possible physiological role of histidine substitution for H2O and regarding the role of beta-conjugated Cbl-analogues recently proposed for targeted delivery of imaging agents.

Vitamin B12 transport proteins: crystallographic analysis of beta-axial ligand substitutions in cobalamin bound to transcobalamin.,Wuerges J, Geremia S, Fedosov SN, Randaccio L IUBMB Life. 2007 Nov;59(11):722-9. PMID:17943552^[1]

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

References

↑ Wuerges J, Geremia S, Fedosov SN, Randaccio L. Vitamin B12 transport proteins: crystallographic analysis of beta-axial ligand substitutions in cobalamin bound to transcobalamin. IUBMB Life. 2007 Nov;59(11):722-9. PMID:17943552

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/2v3n"

@@ Line 1: / Line 1: @@
 ==Crystallographic analysis of upper axial ligand substitutions in cobalamin bound to transcobalamin==
 <StructureSection load='2v3n' size='340' side='right' caption='[[2v3n]], [[Resolution|resolution]] 2.73&Aring;' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=B12:COBALAMIN'>B12</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CYN:CYANIDE+ION'>CYN</scene></td></tr>
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2bb6|2bb6]], [[2v3p|2v3p]], [[2bbc|2bbc]]</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=2v3n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2v3n OCA], [http://pdbe.org/2v3n PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2v3n RCSB], [http://www.ebi.ac.uk/pdbsum/2v3n 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=2v3n FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2v3n OCA], [http://pdbe.org/2v3n PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2v3n RCSB], [http://www.ebi.ac.uk/pdbsum/2v3n PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2v3n ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 13: / Line 14: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/v3/2v3n_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/v3/2v3n_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

2v3n

From Proteopedia

Revision as of 09:02, 12 September 2018

Crystallographic analysis of upper axial ligand substitutions in cobalamin bound to transcobalamin

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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