Abstract
The pleckstrin homology (PH) domain is a family of structurally conserved proteins which can bind inositol phosphate derivatives. Some proteins involved in cellular signaling and cytoskeletal organization possess split PH domains that assemble into a structure which can bind specific inositol phosphates. Here we describe the design of split PH domain from a structurally well-characterized PH domain of phospholipase C (PLC) δ1 and Bruton's tyrosine kinase (Btk), which selectively bind Ins(1,4,5)P3 and Ins(1,3,4,5)P4, respectively. The PH domains fold into a functional structure when the split halves are brought to close proximity, and can be utilized to detect specific inositol phosphate of interest.
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