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1ens

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{{STRUCTURE_1ens| PDB=1ens | SCENE= }}
{{STRUCTURE_1ens| PDB=1ens | SCENE= }}
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'''CRYSTALS OF DEMETALLIZED CONCANAVALIN A SOAKED WITH COBALT HAVING A COBALT ION BOUND IN THE S1 SITE'''
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===CRYSTALS OF DEMETALLIZED CONCANAVALIN A SOAKED WITH COBALT HAVING A COBALT ION BOUND IN THE S1 SITE===
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==Overview==
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The lectin concanavalin A (ConA) sequentially binds a transition metal ion in the metal-binding site S1 and a calcium ion in the metal-binding site S2 to form its saccharide-binding site. Metal-free ConA crystals soaked with either Zn2+ (apoZn-ConA) or Co2+ (apoCo-ConA) display partial binding of these ions in the proto-transition metal-binding site, but no further conformational changes are observed. These structures can represent the very first step in going from metal-free ConA toward the holoprotein. In the co-crystals of metal-free ConA with Zn2+ (Zn-ConA), the zinc ion can fully occupy the S1 site. The positions of the carboxylate ligands Asp10 and Asp19 that bridge the S1 and S2 sites are affected. The ligation to Zn2+ orients Asp10 optimally for calcium ligation and stabilizes Asp19 by a hydrogen bond to one of its water ligands. The neutralizing and stabilizing effect of the binding of Zn2+ in S1 is necessary to allow for subsequent Ca2+ binding in the S2 site. However, the S2 site of monometallized ConA is still disrupted. The co-crystals of metal-free ConA with both Zn2+ and Ca2+ contain the active holoprotein (ConA ZnCa). Ca2+ has induced large conformational changes to stabilize its hepta-coordination in the S2 site, which comprise the trans to cis isomerization of the Ala207-Asp208 peptide bond accompanied by the formation of the saccharide-binding site. The Zn2+ ligation in ConA ZnCa is similar to Mn2+, Cd2+, Co2+, or Ni2+ ligation in the S1 site, in disagreement with earlier extended x-ray absorption fine structure results that suggested a lower coordination number for Zn2+.
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(as it appears on PubMed at http://www.pubmed.gov), where 8663112 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8663112}}
==About this Structure==
==About this Structure==
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[[Category: Concanavalin some]]
[[Category: Concanavalin some]]
[[Category: Plant lectin]]
[[Category: Plant lectin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 1 01:10:23 2008''

Revision as of 22:10, 30 June 2008

Image:1ens.png

Template:STRUCTURE 1ens

CRYSTALS OF DEMETALLIZED CONCANAVALIN A SOAKED WITH COBALT HAVING A COBALT ION BOUND IN THE S1 SITE

Template:ABSTRACT PUBMED 8663112

About this Structure

1ENS is a Single protein structure of sequence from Canavalia ensiformis. Full crystallographic information is available from OCA.

Reference

Sequential structural changes upon zinc and calcium binding to metal-free concanavalin A., Bouckaert J, Poortmans F, Wyns L, Loris R, J Biol Chem. 1996 Jul 5;271(27):16144-50. PMID:8663112

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