title: Diphospho-myo-inositol phosphates in Dictyostelium and Polysphondylium: identification of a new bisdiphospho-myo-inositol tetrakisphosphate.
abstract: The two major diphospho inositol phosphates from the axenic strain Dictyostelium discoideum AX2 were previously investigated and identified as 6-PP-InsP5 and 5,6-bis-PP-InsP4. In order to examine whether these findings are representative of Dictyostelids in general, five non-axenic wild-type species of Dictyostelium and two of Polysphondylium were studied. It was found that all of the Dictyostelium species exhibit similar patterns of diphospho inositol phosphates. By contrast, both of the Polysphondylium species contain 5-PP-InsP5 as the predominant isomer. Besides 5,6-bis-PP-InsP4, a new bis-PP-InsP4 was detected in Polysphondylium. This compound is either 1,5-bis-PP-InsP4 or its corresponding enantiomer 3,5-bis-PP-InsP5. The structures were elucidated by two-dimensional 1H-1H and 1H-31P NMR analysis. Additionally, they were confirmed using a specific 6-PP-InsP(5)-5-kinase from D. discoideum AX2 as an enantio-specific tool and enantiomerically pure reference standards.
authors.affiliation: Fachbereich 9 - Chemie, Bergische Universität GHS Wuppertal, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Laussmann
authors.forename: A
authors.initials: A
authors.lastname: Hansen
authors.forename: K M
authors.initials: KM
authors.lastname: Reddy
authors.forename: K K
authors.initials: KK
authors.lastname: Reddy
authors.forename: J R
authors.initials: JR
authors.lastname: Falck
authors.forename: G
authors.initials: G
authors.lastname: Vogel
mesh_terms: D000818:Animals; D016837:Dictyosteliida / Q000737:chemistry*; D004023:Dictyostelium / Q000737:chemistry*; D007295:Inositol Phosphates / Q000302:isolation & purification*; D019906:Nuclear Magnetic Resonance, Biomolecular; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000378:metabolism; D017856:Phosphotransferases (Phosphate Group Acceptor) / Q000378:metabolism; D013237:Stereoisomerism
chemical_list: D007295:Inositol Phosphates; D017853:Phosphotransferases (Alcohol Group Acceptor); C064990:inositol pentakisphosphate kinase; D017856:Phosphotransferases (Phosphate Group Acceptor); C099438:inositol hexakisphosphate kinase