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The principal project in the laboratory is to understand the structure of the proteins involved in the development of polycystic kidney disease (PKD). PKD is a prevalent autosomal dominant disease caused in the majority of cases by a mutation in one of two genes: PKD1 and PKD2.  PKD1 encodes a large (~4000 amino acid) transmembrane protein of unknown function (PC-1)while PKD2 encodes a smaller (~1000 amino acid) protein which has recently been assigned to the TRP family of ion channels (PC-2). As mutations in either PC-1 or PC-2 cause identical disease progression, it is believed that the two proteins act as part of a common signaling pathway and indeed evidence indicates that the two proteins physically interact.  PC-1 possess a ~3000 amino acid extracellular N-terminal domain containing numerous identified subdomains with cell-cell recognition motifs, a transmembrane domain containing 11 predicted transmembrane helices and a short cytoplasmic domain containing domains necessary for interaction with PC-2. PC-2, in common with other TRP channels, is a non-specific cation channel believed to assemble as a tetramer. We have expressed and purified both the full length PC-2 as well as a fragment of PC-1 containing all 11 transmembrane helices and the intact cytoplasmic C-terminus. Currently we have generated 2D crystals for structure determination with both proteins.  We plan to extend these studies to include the PC-1/PC-2 complex as well as structurally related TRP channels. We are also interested in determining the cryo-EM structure of integrins and their interacting protein partners.


  1. Adair BD, Yeager M. Three-dimensional model of the human platelet integrin alpha iib beta 3 based on electron cryomicroscopy and x-ray crystallography. Proc Natl Acad Sci USA. 2002; 99(22): 14059-64.
  2. Neuman BW, Adair BD, Burns JW, Milligan RA, Buchmeier MJ, Yeager M. Complementarity in the supramolecular design of arenaviruses and retroviruses revealed by electron cryomicroscopy and image analysis. Virol. 2005; 79(6): 3822-30.
  3. Adair BD, Xiong JP, Maddock C, Goodman SL, Arnaout MA, Yeager M. Three-dimensional EM structure of the ectodomain of integrin {alpha}V{beta}3 in a complex with fibronectin. Cell Biol. 2005; 168(7): 1109-18.
  4. Neuman BW, Adair BD, Yoshioka C, Quispe JD, Orca G, Kuhn P, Milligan RA, Yeager M, Buchmeier MJ. Supramolecular architecture of severe acute respiratory syndrome coronavirus revealed by electron cryomicroscopy. Virol. 2006; 80(16): 7918-28.
  5. Adair BD and Yeager M.Electron microscopy of integrins. Methods Enzymol. 2007; 426: 337-73. Review.
  6. Adair BD, Nunn R, Lewis S, Dukes I, Philipson HL, Yeager M. Single particle image reconstruction of the human, recombinant Kv2.1 channel. Biophys J. 2008; 94: 2106-2114.
  7. Adair BD, Xiong JP, Alonso JL, Hyman BT, Arnaout MA. EM structure of the ectodomain of integrin CD11b/CD18 and localization of its ligand-binding site relative to the plasma membrane.PLoS One. 2013;8(2):e57951.
  8. Adair BD, Altintas MM, Möller CC, Arnaout MA, Reiser J. Structure of the kidney slit diaphragm adapter protein CD2-associated protein as determined with electron microscopy.J Am Soc Nephrol. 2014; 25(7): 1465-73.
  9. Van Agthoven JF, Xiong JP, Alonso JL, Rui X, Adair BD, Goodman SL, Arnaout MA. Structural basis for pure antagonism of integrin αVβ3 by a high-affinity form of fibronectin.Nat Struct Mol Biol. 2014; 21(4): 383-8.