Design and synthesis of biotinylated inositol 1,3,4,5-tetrakisphosphate targeting Grp1 pleckstrin homology domain
作者:Kensaku Anraku、Teruhiko Inoue、Kenji Sugimoto、Kota Kudo、Yoshinari Okamoto、Takashi Morii、Yasuo Mori、Masami Otsuka
DOI:10.1016/j.bmc.2011.09.035
日期:2011.11
A bifunctional molecule containing biotin and D-myo-inositol 1,3,4,5-tetrakisphosphate was synthesized. This molecule was designed on the basis of X-ray structure of the complex of D-myo-inositol 1,3,4,5-tetrakisphosphates, Ins(1,3,4,5)P-4, and Grp1 PH (general receptor of phosphoinositides pleckstrin homology) domain for the application to the widely employed biotin-avidin techniques. The building block of inositol moiety was synthesized starting with myo-inositol and assembled with the biotin-linker moiety through a phosphate linkage. The equilibrium dissociation constant K-D of biotinylated Ins(1,3,4,5)P-4 binding of original Grp1 PH domain was 0.14 mu M in pull-down analysis, which was comparable to that of unmodified Ins(1,3,4,5)P-4. Furthermore, biotinylated Ins(1,3,4,5)P-4 had an ability to distinguish Grp1 PH domain from PLC delta(1) PH domain. Thus, biotinylated Ins(1,3,4,5)P-4 retained the binding affinity and selectivity of original Grp1 PH domain, and realized the intracellular Ins(1,3,4,5)P-4 despite a tethering at the 1-phosphate group of inositol. (C) 2011 Elsevier Ltd. All rights reserved.