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[[Image:1oql.gif|left|200px]]
{{Seed}}
[[Image:1oql.png|left|200px]]


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{{STRUCTURE_1oql|  PDB=1oql  |  SCENE=  }}  
{{STRUCTURE_1oql|  PDB=1oql  |  SCENE=  }}  


'''Mistletoe Lectin I from Viscum album complexed with galactose'''
===Mistletoe Lectin I from Viscum album complexed with galactose===




==Overview==
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The X-ray structure of mistletoe lectin I (MLI), a type-II ribosome-inactivating protein (RIP), cocrystallized with galactose is described. The model was refined at 3.0 A resolution to an R-factor of 19.9% using 21 899 reflections, with Rfree 24.0%. MLI forms a homodimer (A-B)2 in the crystal, as it does in solution at high concentration. The dimer is formed through contacts between the N-terminal domains of two B-chains involving weak polar and non-polar interactions. Consequently, the overall arrangement of sugar-binding sites in MLI differs from those in monomeric type-II RIPs: two N-terminal sugar-binding sites are 15 A apart on one side of the dimer, and two C-terminal sugar-binding sites are 87 A apart on the other side. Galactose binding is achieved by common hydrogen bonds for the two binding sites via hydroxy groups 3-OH and 4-OH and hydrophobic contact by an aromatic ring. In addition, at the N-terminal site 2-OH forms hydrogen bonds with Asp27 and Lys41, and at the C-terminal site 3-OH and 6-OH undergo water-mediated interactions and C5 has a hydrophobic contact. MLI is a galactose-specific lectin and shows little affinity for N-acetylgalactosamine. The reason for this is discussed. Structural differences among the RIPs investigated in this study (their quaternary structures, location of sugar-binding sites, and fine sugar specificities of their B-chains, which could have diverged through evolution from a two-domain protein) may affect the binding sites, and consequently the cellular transport processes and biological responses of these toxins.
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{{ABSTRACT_PUBMED_12823544}}


==About this Structure==
==About this Structure==
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[[Category: Ricin-like]]
[[Category: Ricin-like]]
[[Category: Type-ii ribosome-inactivating protein]]
[[Category: Type-ii ribosome-inactivating protein]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 04:09:56 2008''
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 23:24:11 2008''

Revision as of 20:24, 27 July 2008

File:1oql.png

Template:STRUCTURE 1oql

Mistletoe Lectin I from Viscum album complexed with galactose

Template:ABSTRACT PUBMED 12823544

About this Structure

1OQL is a Protein complex structure of sequences from Viscum album. Full crystallographic information is available from OCA.

Reference

Crystal structure at 3 A of mistletoe lectin I, a dimeric type-II ribosome-inactivating protein, complexed with galactose., Niwa H, Tonevitsky AG, Agapov II, Saward S, Pfuller U, Palmer RA, Eur J Biochem. 2003 Jul;270(13):2739-49. PMID:12823544

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