3FFD

Structure of parathyroid hormone-related protein complexed to a neutralizing monoclonal antibody

Summary for 3FFD

• Entry DOI: 10.2210/pdb3ffd/pdb
• Descriptor: Monoclonal antibody, heavy chain, Fab fragment, Monoclonal antibody, light chain, Fab fragment, Parathyroid hormone-related protein, ... (4 entities in total)
• Functional Keywords: pthrp complexed to fab, cleavage on pair of basic residues, hormone, nucleus, secreted, immune system-hormone complex, immune system/hormone
• Biological source: Mus musculus (mouse); More
• Cellular location: Cytoplasm: P12272
• Total number of polymer chains: 3
• Total formula weight: 59688.98

Authors

Mckinstry, W.J.,Polekhina, G.,Diefenbach-Jagger, H.,Ho, P.W.M.,Sato, K.,Onuma, E.,Gillespie, M.T.,Martin, T.J.,Parker, M.W. (deposition date: 2008-12-03, release date: 2009-04-28, Last modification date: 2023-11-01)

Primary citation

McKinstry, W.J.,Polekhina, G.,Diefenbach-Jagger, H.,Ho, P.W.M.,Sato, K.,Onuma, E.,Gillespie, M.T.,Martin, T.J.,Parker, M.W.
Structural basis for antibody discrimination between two hormones that recognize the parathyroid hormone receptor
J.Biol.Chem., 284:15557-15563, 2009

PubMed Abstract: Parathyroid hormone-related protein (PTHrP) plays a vital role in the embryonic development of the skeleton and other tissues. When it is produced in excess by cancers it can cause hypercalcemia, and its local production by breast cancer cells has been implicated in the pathogenesis of bone metastasis formation in that disease. Antibodies have been developed that neutralize the action of PTHrP through its receptor, parathyroid hormone receptor 1, without influencing parathyroid hormone action through the same receptor. Such neutralizing antibodies against PTHrP are therapeutically effective in animal models of the humoral hypercalcemia of malignancy and of bone metastasis formation. We have determined the crystal structure of the complex between PTHrP (residues 1-108) and a neutralizing monoclonal anti-PTHrP antibody that reveals the only point of contact is an alpha-helical structure extending from residues 14-29. Another striking feature is that the same residues that interact with the antibody also interact with parathyroid hormone receptor 1, showing that the antibody and the receptor binding site on the hormone closely overlap. The structure explains how the antibody discriminates between the two hormones and provides information that could be used in the development of novel agonists and antagonists of their common receptor.

PubMed: 19346515
DOI: 10.1074/jbc.M900044200

Experimental method

X-RAY DIFFRACTION (2 Å)