Abstract:
:Rab GTPases require special machinery for protein prenylation, which include Rab escort protein (REP) and Rab geranylgeranyl transferase (RGGT). The current model of Rab geranylgeranylation proposes that REP binds Rab and presents it to RGGT. After geranylgeranylation of Rab C-terminal cysteines, REP delivers the prenylated protein to membranes. The REP-like protein Rab GDP dissociation inhibitor (RabGDI) then recycles the prenylated Rab between the membrane and the cytosol. The recent solution of crystal structures of the Rab prenylation machinery has helped to refine this model and provided further insights. The hydrophobic prenyl binding pocket of RGGT and geranylgeranyl transferase type-I (GGT-I) differs from that of farnesyl transferase (FT). A bulky tryptophan residue in FT restricts the size of the pocket, whereas in RGGT and GGT-I, this position is occupied by smaller residues. A highly conserved phenylalanine in REP, which is absent in RabGDI, is critical for the formation of the REP:RGGT complex. Finally, a geranylgeranyl binding site conserved in REP and RabGDI has been identified within helical domain II. The postprenylation events, including the specific targeting of Rabs to target membranes and the requirement for single versus double geranylgeranylation by different Rabs, remain obscure and should be the subject of future studies.
journal_name
J Lipid Resjournal_title
Journal of lipid researchauthors
Leung KF,Baron R,Seabra MCdoi
10.1194/jlr.R500017-JLR200keywords:
subject
Has Abstractpub_date
2006-03-01 00:00:00pages
467-75issue
3eissn
0022-2275issn
1539-7262pii
R500017-JLR200journal_volume
47pub_type
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journal_title:Journal of lipid research
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journal_title:Journal of lipid research
pub_type: 杂志文章
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journal_title:Journal of lipid research
pub_type: 杂志文章
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journal_title:Journal of lipid research
pub_type: 杂志文章
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1984-01-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
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更新日期:1993-05-01 00:00:00
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journal_title:Journal of lipid research
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更新日期:1979-03-01 00:00:00
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pub_type: 杂志文章
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更新日期:2019-01-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1995-07-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1987-04-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1984-10-01 00:00:00
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journal_title:Journal of lipid research
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journal_title:Journal of lipid research
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doi:
更新日期:2000-06-01 00:00:00
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pub_type: 杂志文章
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更新日期:2014-01-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1980-09-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1988-01-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1978-05-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1980-11-01 00:00:00
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journal_title:Journal of lipid research
pub_type: 杂志文章
doi:
更新日期:1973-05-01 00:00:00