'''THREE DIMENSIONAL STRUCTURE OF A HUMANIZED ANTI-IFN-GAMMA FAB (HuZAF) IN P21 21 21 SPACE GROUP'''
===THREE DIMENSIONAL STRUCTURE OF A HUMANIZED ANTI-IFN-GAMMA FAB (HuZAF) IN P21 21 21 SPACE GROUP===
==Overview==
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Three-dimensional structures were determined for two crystal forms (orthorhombic P2(1)2(1)2(1) and monoclinic C2) of the Fab from the humanized version of a murine monoclonal antibody (AF2) that possesses binding and potent neutralizing activity against human interferon gamma (IFN-gamma). This humanized antibody (HuZAF; USAN name fontolizumab) is currently in phase II clinical trials for the treatment of Crohn's disease. HuZAF exhibits binding and IFN-gamma neutralizing capacities that closely approximate those of the original antibody. It is shown that HuZAF, whose VH domain was designed using a best-sequence-fit approach, is closer structurally to its mouse precursor than is a version whose VH was constructed using a human sequence with lower homology to the original mouse sequence. This work thus offers direct structural evidence in support of the best-sequence-fit approach and adds to previous results of biological and biochemical evaluations of distinctly engineered antibodies that also favored the use of a best-sequence-fit strategy. A second crystal type appeared during attempts to crystallize the Fab-IFN-gamma complex. The antibody-antigen complex that existed in solution dissociated in the crystallization mixture. A conformationally altered but unliganded HuZAF protein crystallized in a different space group (C2), with two Fab molecules in the asymmetric unit. In this crystal lattice, no space was available for accommodating the IFN-gamma antigen. Thus, there are currently three slightly different structures of the HuZAF Fab.
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{{ABSTRACT_PUBMED_15388922}}
==About this Structure==
==About this Structure==
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[[Category: Immune system]]
[[Category: Immune system]]
[[Category: X-ray structure]]
[[Category: X-ray structure]]
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Revision as of 16:15, 27 July 2008
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