Download MendeleyCrystal structure of human lithostathine, the pancreatic inhibitor of stone formation.
Bertrand, J.A., Pignol, D., Bernard, J.P., Verdier, J.M., Dagorn, J.C., Fontecilla-Camps, J.C.(1996) EMBO J 15: 2678-2684
- PubMed: 8654365
- Primary Citation of Related Structures:
1LIT - PubMed Abstract:
Human lithostathine (HLIT) is a pancreatic glycoprotein which inhibits the growth and nucleation of calcium carbonate crystals. The crystal structure of the monomeric 17 kDa HLIT, determined to a resolution of 1.55 angstroms, was refined to a crystallographic R-factor of 18.6%. Structural comparison with the carbohydrate-recognition domains of rat mannose-binding protein and E-selectin indicates that the C-terminal domain of HLIT shares a common architecture with the C-type lectins. Nevertheless, HLIT does not bind carbohydrate nor does it contain the characteristic calcium-binding sites of the C-type lectins. In consequence, HLIT represents the first structurally characterized member of this superfamily which is not a lectin. Analysis of the charge distribution and calculation of its dipole moment reveal that HLIT is a strongly polarized molecule. Eight acidic residues which are separated by regular 6 angstrom spacings form a unique and continuous patch on the molecular surface. This arrangement coincides with the distribution of calcium ions on certain planes of the calcium carbonate crystal; the dipole moment of HLIT may play a role in orienting the protein on the crystal surface prior to the more specific interactions of the acidic residues.
Organizational Affiliation:
Laboratoire de Cristallographie et Cristallogénèse des Protéines, Institut de Biologie Structurale J.P. Ebel, CEA-CNRS, France.
