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<I>In Vitro</I> Assembly, Purification, and Crystallization of the Rab Geranylgeranyl Transferase:Substrate Complex

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons98720

Rak,  Alexey
Abt. III: Physikalische Biochemie, Max Planck Institute of Molecular Physiology, Max Planck Society;

Niculae,  Anca
Max Planck Institute of Molecular Physiology, Max Planck Society;

Thomä,  Nicolas H.
Max Planck Institute of Molecular Physiology, Max Planck Society;

Sidorovitch,  Vadim
Max Planck Institute of Molecular Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons98693

Goody,  Roger S.
Abt. III: Physikalische Biochemie, Max Planck Institute of Molecular Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons98674

Alexandrov,  Kirill
Abt. III: Physikalische Biochemie, Max Planck Institute of Molecular Physiology, Max Planck Society;

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Citation

Rak, A., Niculae, A., Kalinin, A., Thomä, N. H., Sidorovitch, V., Goody, R. S., et al. (2002). <I>In Vitro</I> Assembly, Purification, and Crystallization of the Rab Geranylgeranyl Transferase:Substrate Complex. Protein Expression and Purification, 25(1): 1, pp. 23-30. Retrieved from http://dx.doi.org/10.1006/prep.2001.1605.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-0E62-0
Abstract
Posttranslational modification with the geranygeranyl moiety is essential for the ability of Rab GTPases to control processes of membrane docking and fusion. This modification is conferred by Rab geranylgeranyltransferase (RabGGTase), which catalyzes the transfer of two 20-carbon geranylgeranyl groups from geranylgeranyl pyrophosphate onto C-terminal cysteine residues of Rab proteins. The enzyme consists of a catalytic alp heterodimer and an accessory protein termed Rab escort protein (REP-1) that delivers the newly prenylated Rab proteins to their target membrane. In order to understand the structural basis of Rab prenylation, we have investigated in vitro assembly and crystallization of the RabGGTase:REP-1:Rab complex. In order to ensure maximal stability of the ternary complex, we generated its monoprenylated form, which corresponds to a reaction intermediate and displays the highest affinity between the components. This was achieved by expressing the individual components in baculovirus and Escherichia coli systems with subsequent purification followed by in vitro monoprenylation of Rab7 with immobilized recombinant RabGGTase. Purified monoprenylated REP-1:Rab7 was complexed with recombinant RabGGTase and crystallized in hanging drops. The crystals obtained initially diffract to 8 Angstrom on an in-house X-ray source. (C) 2002 Elsevier Science (USA)