Novel inositol phospholipid headgroup surrogate crystallized in the pleckstrin homology domain of protein kinase Bα

Stephen J. Mills, David Komander, Melanie N. Trusselle, Stephen T. Safrany, Daan M. F. van Aalten, Barry V. L. Potter

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Protein kinase B (PKB/Akt) plays a key role in cell signaling. The PH domain of PKB binds phosphatidylinositol 3,4,5-trisphosphate translocating PKB to the plasma membrane for activation by 3-phosphoinositide-dependent protein kinase 1. The crystal structure of the headgroup inositol 1,3,4,5-tetrakisphosphate Ins(1,3,4,5)P 4-PKB complex facilitates in silico ligand design. The novel achiral analogue benzene 1,2,3,4-tetrakisphosphate (Bz(1,2,3,4)P4) possesses phosphate regiochemistry different from that of Ins(1,3,4,5)P 4 and surprisingly binds with similar affinity as the natural headgroup. Bz(1,2,3,4)P 4 co-crystallizes with the PKBa PH domain in a fashion also predictable in silico. The 2-phosphate of Bz(1,2,3,4)P 4 does not interact with any residue, and the D5-phosphate of Ins(1,3,4,5)P 4 is not mimicked by Bz(1,2,3,4)P 4. Bz(1,2,3,4)P 4 is an example of a simple inositol phosphate surrogate crystallized in a protein, and this approach could be applied to design modulators of inositol polyphosphate binding proteins.

Original languageEnglish
Pages (from-to)242-246
Number of pages5
JournalACS Chemical Biology
Volume2
Issue number4
DOIs
Publication statusPublished - 1 Apr 2007

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