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1bfo

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[[Image:1bfo.jpg|left|200px]]
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{{STRUCTURE_1bfo| PDB=1bfo | SCENE= }}
{{STRUCTURE_1bfo| PDB=1bfo | SCENE= }}
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'''CAMPATH-1G IGG2B RAT MONOCLONAL FAB'''
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===CAMPATH-1G IGG2B RAT MONOCLONAL FAB===
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==Overview==
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The CAMPATH-1 family of antibodies are able systematically to lyse human lymphocytes with human complement by targeting the small cell-surface glycoprotein CD52, commonly called the CAMPATH-1 antigen. These antibodies have been used clinically for several years, providing therapy for patients with a variety of immunologically mediated diseases. We report here the first X-ray crystallographic analyses of a Fab fragment from a rat antibody, the original therapeutic monoclonal CAMPATH-1G and its humanized counterpart CAMPATH-1H, into which the six complementarity-determining regions of the rat antibody have been introduced. These structures have been refined at 2.6 A and 3.25 A resolution, respectively. The VL domains of adjacent molecules of CAMPATH-1H form a symmetric dimer within the crystals with an inter-molecular extended beta-sheet as seen in light chain dimers of the kappa class. Crystals of CAMPATH-1G have translational pseudo-symmetry. Within the antibody-combining sites, which are dominated by the protrusion of LysH52b and LysH53 from hypervariable loop H2, the charge distribution and overall integrity are highly conserved, but large changes in the position of loop H1 are observed and an altered conformation of loop H2. The major determinants of this are framework residues H71 and H24, whose identity differs in these two antibodies. These structures provide a detailed structural insight into the transplantation of an intact antibody-combining site between a rodent and a human framework, and provide an increased understanding of the specificity and antigen affinity of this pair of CAMPATH-1 antibodies for CD52. This study forms the structural basis for future modification and design of more effective antibodies to this important antigen.
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(as it appears on PubMed at http://www.pubmed.gov), where 9811544 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9811544}}
==About this Structure==
==About this Structure==
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[[Category: Cd52]]
[[Category: Cd52]]
[[Category: Fab]]
[[Category: Fab]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 19:03:17 2008''

Revision as of 16:03, 30 June 2008

Image:1bfo.png

Template:STRUCTURE 1bfo

CAMPATH-1G IGG2B RAT MONOCLONAL FAB

Template:ABSTRACT PUBMED 9811544

About this Structure

1BFO is a Protein complex structure of sequences from Rattus rattus. Full crystallographic information is available from OCA.

Reference

Crystal structures of a rat anti-CD52 (CAMPATH-1) therapeutic antibody Fab fragment and its humanized counterpart., Cheetham GM, Hale G, Waldmann H, Bloomer AC, J Mol Biol. 1998 Nov 20;284(1):85-99. PMID:9811544

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