A transmembrane helix dimer: structure and implications.
MacKenzie, K.R., Prestegard, J.H., Engelman, D.M.(1997) Science 276: 131-133
- PubMed: 9082985 
- DOI: 10.1126/science.276.5309.131
- Primary Citation of Related Structures:  
1AFO - PubMed Abstract: 
The three-dimensional structure of the dimeric transmembrane domain of glycophorin A (GpA) was determined by solution nuclear magnetic resonance spectroscopy of a 40-residue peptide solubilized in aqueous detergent micelles. The GpA membrane-spanning alpha helices cross at an angle of -40 degrees and form a small but well-packed interface that lacks intermonomer hydrogen bonds ...