2c1o

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[[Image:2c1o.gif|left|200px]]
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{{Seed}}
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[[Image:2c1o.png|left|200px]]
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{{STRUCTURE_2c1o| PDB=2c1o | SCENE= }}
{{STRUCTURE_2c1o| PDB=2c1o | SCENE= }}
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'''ENAIIHIS FAB FRAGMENT IN THE FREE FORM'''
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===ENAIIHIS FAB FRAGMENT IN THE FREE FORM===
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==Overview==
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Enantioselective antibodies can separate the enantiomers of a chiral compound in a highly specific manner. We have recently reported the cloning and applications of a recombinant Fab-fragment, ENA11His, in the enantioseparation of a drug candidate, finrozole, which contains two chiral centers. Here, the crystal structures of this enantioselective antibody Fab-fragment are determined in the absence of the hapten at a resolution of 2.75 A, and in the presence of the hapten at 2.05 A resolution. The conformation of the protein was found to be similar in both free and complex forms. The hapten molecule was tightly bound in a deep cleft between the light and heavy chains of the Fab-fragment. The complex structure also allowed us to describe the molecular basis for enantioselectivity and to deduce the absolute configurations of all the four different stereoisomers (a-d) of finrozole. The ENA11His antibody fragment selectively binds the SR (a) enantiomer from the racemic mixture of a and d-enantiomers, thus allowing separation from the pharmacologically most active RS enantiomer (d). In particular, Asp95 and Asn35 of the H-chain in the ENA11 His antibody seem to provide this specificity through hydrogen bonding.
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(as it appears on PubMed at http://www.pubmed.gov), where 16427081 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16427081}}
==About this Structure==
==About this Structure==
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[[Category: Immune system]]
[[Category: Immune system]]
[[Category: Immunoglobulin domain]]
[[Category: Immunoglobulin domain]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 21:06:40 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 09:00:58 2008''

Revision as of 06:01, 28 July 2008

Image:2c1o.png

Template:STRUCTURE 2c1o

ENAIIHIS FAB FRAGMENT IN THE FREE FORM

Template:ABSTRACT PUBMED 16427081

About this Structure

2C1O is a Single protein structure of sequence from Mus musculus. Full crystallographic information is available from OCA.

Reference

Crystal structures of an enantioselective fab-fragment in free and complex forms., Parkkinen T, Nevanen TK, Koivula A, Rouvinen J, J Mol Biol. 2006 Mar 24;357(2):471-80. Epub 2006 Jan 3. PMID:16427081

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