Structural analysis and detection of biological inositol pyrophosphates reveals that the VIP/PPIP5K family are 1/3-kinases.
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Structural analysis and detection of biological inositol pyrophosphates reveals that the VIP/PPIP5K family are 1/3-kinases. / Lin, Hongying; Fridy, Peter C; Ribeiro, Anthony A; Choi, Jae H; Barma, Deb K; Vogel, Günter; Falck, J R; Shears, Stephen B; York, John D; Mayr, Georg W.
in: J BIOL CHEM, Jahrgang 284, Nr. 3, 3, 2009, S. 1863-1872.Publikationen: SCORING: Beitrag in Fachzeitschrift/Zeitung › SCORING: Zeitschriftenaufsatz › Forschung › Begutachtung
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TY - JOUR
T1 - Structural analysis and detection of biological inositol pyrophosphates reveals that the VIP/PPIP5K family are 1/3-kinases.
AU - Lin, Hongying
AU - Fridy, Peter C
AU - Ribeiro, Anthony A
AU - Choi, Jae H
AU - Barma, Deb K
AU - Vogel, Günter
AU - Falck, J R
AU - Shears, Stephen B
AU - York, John D
AU - Mayr, Georg W.
PY - 2009
Y1 - 2009
N2 - We have characterized the positional specificity of the mammalian and yeast VIP/PPIP5K family of inositol phosphate kinases. We deployed a micro-scale metal-dye detection protocol coupled to a high-performance liquid chromatography system that was calibrated with synthetic and biologically-synthesized standards of inositol pyrophosphates. In addition, we have directly analyzed the structures of biological inositol pyrophosphates using two-dimensional 1H-1H and 1H-31P nuclear magnetic resonance spectroscopy. Using these tools, we have determined that the mammalian and yeast VIP/PPIP5K family phosphorylate the 1/3-position of the inositol ring in vitro and in vivo. For example, the VIP/PPIP5K enzymes convert inositol hexakisphosphate to 1/3-diphosphoinositol pentakisphosphate. The latter compound has not previously been identified in any organism. We have also unequivocally determined that 1/3,5-(PP)2-IP4 is the isomeric structure of the bis-diphosphoinositol tetrakisphosphate that is synthesized by yeasts and mammals, through a collaboration between the IP6K and VIP/PPIP5K enzymes. These data uncover phylogenetic variability within the crown taxa in the structures of inositol pyrophosphates. For example, in the Dictyostelids the major bis-diphosphoinositol tetrakisphosphate is 5,6-(PP)2-IP4 (Laussmann et al., Biochem. J. 1996 315 715-720). Our study brings us closer to the goal of understanding the structure/function relationships that control specificity in the synthesis and biological actions of inositol pyrophosphates.
AB - We have characterized the positional specificity of the mammalian and yeast VIP/PPIP5K family of inositol phosphate kinases. We deployed a micro-scale metal-dye detection protocol coupled to a high-performance liquid chromatography system that was calibrated with synthetic and biologically-synthesized standards of inositol pyrophosphates. In addition, we have directly analyzed the structures of biological inositol pyrophosphates using two-dimensional 1H-1H and 1H-31P nuclear magnetic resonance spectroscopy. Using these tools, we have determined that the mammalian and yeast VIP/PPIP5K family phosphorylate the 1/3-position of the inositol ring in vitro and in vivo. For example, the VIP/PPIP5K enzymes convert inositol hexakisphosphate to 1/3-diphosphoinositol pentakisphosphate. The latter compound has not previously been identified in any organism. We have also unequivocally determined that 1/3,5-(PP)2-IP4 is the isomeric structure of the bis-diphosphoinositol tetrakisphosphate that is synthesized by yeasts and mammals, through a collaboration between the IP6K and VIP/PPIP5K enzymes. These data uncover phylogenetic variability within the crown taxa in the structures of inositol pyrophosphates. For example, in the Dictyostelids the major bis-diphosphoinositol tetrakisphosphate is 5,6-(PP)2-IP4 (Laussmann et al., Biochem. J. 1996 315 715-720). Our study brings us closer to the goal of understanding the structure/function relationships that control specificity in the synthesis and biological actions of inositol pyrophosphates.
M3 - SCORING: Zeitschriftenaufsatz
VL - 284
SP - 1863
EP - 1872
JO - J BIOL CHEM
JF - J BIOL CHEM
SN - 0021-9258
IS - 3
M1 - 3
ER -