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Structure of KW-2228, a tailored human granulocyte colony-stimulating factor with enhanced biological activity and
I Fujii1, Y Nagahara, M Yamasaki
1Department of Biological Science and Technology, Tokai University, Numazu, Shizuoka, Japan.
Abstract:
KW-2228 is a tailored human granulocyte colony-stimulating factor (hG-CSF) which has more potent granulopoietic activity and is more stable than wild-type hG-CSF. Analysis of the 2.3 A resolution crystal structure of KW-2228 unambiguously revealed a four-alpha-helix bundle motif with up-up-down-down connectivity. The structures of long overhand loops connecting the helices and the N-terminus have been definitively determined. The present analysis has clearly revealed that substituted residues play important roles in fastening a long overhand loop to the N- and C-termini to fix the conformation. This conformation should be responsible for a substantial enhancement of the biological activity and stability.