Novel crystal forms of a proteolytic core of the single‐stranded DNA‐binding protein (SSB) from E. coli

A proteolytic core of the Escherichia coli single‐stranded DNA‐binding protein (SSB) has been crystallized from phosphate buffer. Crystals suitable for X‐ray data collection display monoclinic space group C2 with α = 106.8, b = 62.3 c = 100.2 Å, β = 112° and contain one tetramer of proteolysis product SSB*‐A per asymmetric unit. Two other crystal forms have been obtained in the presence of the inhibitor diisopropylfluorophosphate.