Gregory Smutzer | Jun 10, 2001 | 10 min read
Updated! Suppliers of Tools for X-ray Crystallography Courtesy of Amersham Pharmacia BiotechDetail of the electron density map of deacetoxycephalosporin C synthase from Streptomyces clavuligerus. Two important approaches can be used to determine the three-dimensional structure of macromolecules. Nuclear magnetic resonance (NMR) spectroscopy yields information on the structure of proteins in solution, but it has a size limitation of approximately 150 amino acid residues (about 16,500 daltons),