Biochem J. 1997 Feb 15;322 ( Pt 1):31-3.

Diphospho-myo-inositol phosphates from Dictyostelium identified as D-6-diphospho-myo-inositol pentakisphosphate and D-5,6-bisdiphospho-myo-inositol tetrakisphosphate.

Laussmann T, Reddy KM, Reddy KK, Falck JR, Vogel G.

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Fachbereich 9 - Chemie, Bergische Universität GHS Wuppertal, Federal Republic of Germany.

Abstract

Two diphospho-myo-inositol phosphates from Dictyostelium were recently investigated by two-dimensional 1H/31P NMR analysis and assigned to be either D-4-diphospho-myo-inositol pentakisphosphate (D-4-PP-InsP5) and D-4,5-bisdiphospho-myo-inositol tetrakisphosphate (D-4,5-bis-PP-InsP4) or their corresponding enantiomers D-6-PP-InsP5 and D-5,6-bis-PP-InsP4. In the present study the naturally occurring enantiomers were identified by using defined synthetic PP-InsP5 isomers as substrates for a partially purified PP-InsP5 5-kinase from Dictyostelium. This enzyme specifically phosphorylates the naturally occurring PP-InsP5 and the synthetic D-6-PP-InsP5, leading to D-5,6-bis-PP-InsP4. In contrast, neither D-4-PP-InsP5 nor D-1-PP-InsP5 or D-3-PP-InsP5 are converted by the enzyme.

PMID:: 9078239; [PubMed - indexed for MEDLINE]
PMCID:: PMC1218154

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