Crystallization and preliminary crystallographic study of HIP/PAP, a human C-lectin overexpressed in primary liver cancers.

Human HIP/PAP is an adhesion protein expressed in normal pancreatic and Paneth cells and overexpressed in hepatocellular carcinoma. HIP/PAP was crystallized using the Hampton Research Crystal Screen and SAmBA software to define the optimal crystallization protocol. The crystals belong to the orthorhombic space group P2(1)2(1)2(1), with unit-cell parameters a = 30.73, b = 49.35, c = 92.15 A and one molecule in the asymmetric unit. Flash-frozen crystals diffract to 1. 78 A resolution using synchrotron radiation. A molecular-replacement solution was obtained using the human Reg/lithostathine structure and the AMoRe software.