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  Phosphoisoprenoids modulate association of Rab geranylgeranyltransferase with REP-1

Thomä, N. H., Iakovenko, A., Goody, R. S., & Alexandrov, K. (2001). Phosphoisoprenoids modulate association of Rab geranylgeranyltransferase with REP-1. Journal of Biological Chemistry, 276(52): 1, pp. 48637-48643. Retrieved from http://dx.doi.org/10.1074/jbc.M108241200.

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Genre: Zeitschriftenartikel
Alternativer Titel : J. Biol. Chem.

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 Urheber:
Thomä, Nicolas H.1, Autor
Iakovenko, Andrei1, Autor
Goody, Roger S.2, Autor           
Alexandrov, Kirill2, Autor           
Affiliations:
1Max Planck Institute of Molecular Physiology, Max Planck Society, ou_1753286              
2Abt. III: Physikalische Biochemie, Max Planck Institute of Molecular Physiology, Max Planck Society, ou_1753289              

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 Zusammenfassung: Rab geranylgeranyltransferase (RabGGTase or GGTase-II) catalyzes the post-translational prenylation of Rab proteins. Rab proteins are recognized as substrates only when they are complexed to Rab Escort Protein (REP). The classical model of prenylation complex assembly assumes initial formation of the Rab.REP binary complex, which subsequently binds to RabGGTase loaded with the isoprenoid donor geranylgeranyl pyrophosphate (GGpp). We demonstrate here that REP-1 can also associate with RabGGTase in the absence of Rab protein and that this interaction is dramatically strengthened by the presence of phosphoisoprenoids such as GGpp. The GGpp-dependent interaction between RabGGTase and REP-1 was observed using affinity precipitations and gel filtration and was quantitated on the basis of fluorescence assays. In the presence of GGpp, REP-1 binds to RabGGTase with a K-d value of similar to10 nM, while in its absence the affinity between the two proteins is in the micromolar range. We further demonstrate that binding of Rab7 to the RabGGTase.GGpp.REP-1 complex occurs without prior dissociation of REP-1. Analysis of binding and prenylation rate constants indicate that the RabGGTase.GGpp.REP-1 complex can function as a kinetically competent intermediate of the prenylation reaction. We conclude that, depending on the prevailing concentrations, binding of REP-1 to RabGGTase in the presence of GGpp may serve as an alternative pathway for the assembly of the prenylation machinery in vivo. Implications of these findings for the role of REP-1 in the prenylation reaction are discussed.

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Sprache(n): eng - English
 Datum: 2001-12-28
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 13880
URI: http://dx.doi.org/10.1074/jbc.M108241200
 Art des Abschluß: -

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Titel: Journal of Biological Chemistry
  Alternativer Titel : J. Biol. Chem.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 276 (52) Artikelnummer: 1 Start- / Endseite: 48637 - 48643 Identifikator: -