The alpha aneurism: a structural motif revealed in an insertion mutant of staphylococcal nuclease.
Keefe, L.J., Sondek, J., Shortle, D., Lattman, E.E.(1993) Proc Natl Acad Sci U S A 90: 3275-3279
- PubMed: 8475069 
- DOI: https://doi.org/10.1073/pnas.90.8.3275
- Primary Citation of Related Structures:  
1STY - PubMed Abstract: 
The x-ray crystal structure of a mutant of staphylococcal nuclease that contains a single glycine residue inserted in the C-terminal alpha-helix has been solved to 1.67 A resolution and refined to a crystallographic R value of 0.170. This inserted glycine residue is accommodated in the alpha-helix by formation of a previously uncharacterized bulge, which we term the alpha aneurism. A conformational search of known protein structures has identified the alpha aneurism in a number of protein families, including the histocompatibility antigens and hemoglobins.
Organizational Affiliation: 
Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2185.