Figure 1From: Crystal structure of a DNA polymerase sliding clamp from a Gram-positive bacteriumAlignment of the sequences of the Streptococcus pyogenes and E. coli β subunits as done by BLAST http://www.ncbi.nlm.nih.gov/BLAST/. Secondary structure elements are labeled using the nomenclature first used for E. coli β in ref. [10]. An additional β-strand found only in domain I of the S. pyogenes clamp from residues 67–71 is labeled as β4b.Back to article page