2I9L

Structure of Fab 7D11 from a neutralizing antibody against the poxvirus L1 protein

Summary for 2I9L

• Entry DOI: 10.2210/pdb2i9l/pdb
• Descriptor: Antibody 7D11 light chain, Antibody 7D11 heavy chain, Virion membrane protein M25, ... (5 entities in total)
• Functional Keywords: neutralizing antibody, poxvirus, antibody complex, immune system-viral protein complex, immune system/viral protein
• Biological source: Vaccinia virus; More
• Cellular location: Virion membrane ; Single-pass membrane protein : P07612
• Total number of polymer chains: 12
• Total formula weight: 270245.77

Authors

Su, H.P.,Golden, J.W.,Gittis, A.G.,Moss, B.,Hooper, J.W.,Garboczi, D.N. (deposition date: 2006-09-05, release date: 2007-09-18, Last modification date: 2023-08-30)

Primary citation

Su, H.-P.,Golden, J.W.,Gittis, A.G.,Hooper, J.W.,Garboczi, D.N.
Structural basis for the binding of the neutralizing antibody, 7D11, to the poxvirus L1 protein
Virology, 368:331-341, 2007

PubMed Abstract: Medical countermeasures to prevent or treat smallpox are needed due to the potential use of poxviruses as biological weapons. Safety concerns with the currently available smallpox vaccine indicate a need for research on alternative poxvirus vaccine strategies. Molecular vaccines involving the use of proteins and/or genes and recombinant antibodies are among the strategies under current investigation. The poxvirus L1 protein, encoded by the L1R open reading frame, is the target of neutralizing antibodies and has been successfully used as a component of both protein subunit and DNA vaccines. L1-specific monoclonal antibodies (e.g., mouse monoclonal antibody mAb-7D11, mAb-10F5) with potent neutralizing activity bind L1 in a conformation-specific manner. This suggests that proper folding of the L1 protein used in molecular vaccines will affect the production of neutralizing antibodies and protection. Here, we co-crystallized the Fab fragment of mAb-7D11 with the L1 protein. The crystal structure of the complex between Fab-7D11 and L1 reveals the basis for the conformation-specific binding as recognition of a discontinuous epitope containing two loops that are held together by a disulfide bond. The structure of this important conformational epitope of L1 will contribute to the development of molecular poxvirus vaccines and also provides a novel target for anti-poxvirus drugs. In addition, the sequence and structure of Fab-7D11 will contribute to the development of L1-targeted immunotherapeutics.

PubMed: 17688903
DOI: 10.1016/j.virol.2007.06.042

Experimental method

X-RAY DIFFRACTION (3.1 Å)