1vet
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(New page: 200px<br /><applet load="1vet" size="450" color="white" frame="true" align="right" spinBox="true" caption="1vet, resolution 1.9Å" /> '''Crystal Structure of ...)
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Revision as of 02:40, 21 November 2007
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Crystal Structure of p14/MP1 at 1.9 A resolution
Overview
Signaling pathways in eukaryotic cells are often controlled by the, formation of specific signaling complexes, which are coordinated by, scaffold and adaptor proteins. Elucidating their molecular architecture is, essential to understand the spatial and temporal regulation of cellular, signaling. p14 and MP1 form a tight (K(d) = 12.8 nM) endosomal, adaptor/scaffold complex, which regulates mitogen-activated protein kinase, (MAPK) signaling. Here, we present the 1.9-A crystal structure of a, biologically functional p14/MP1 complex. The overall topology of the, individual MP1 and p14 proteins is almost identical, having a central, five-stranded beta-sheet sandwiched between a two-helix and a one-helix, layer. Formation of the p14/MP1 heterodimer proceeds by beta-sheet, augmentation and yields a unique, almost symmetrical, complex with several, potential protein-binding sites on its surface. Mutational analysis, allowed identification of the p14 endosomal adaptor motif, which seems to, orient the complex relative to the endosomal membrane. Two highly, conserved and hydrophobic protein-binding sites are located on the, opposite "cytoplasmic" face of the p14/MP1 heterodimer and might therefore, function as docking sites for the target proteins extracellular regulated, kinase (ERK) 1 and MAPK/ERK kinase 1. Furthermore, detailed sequence, analyses revealed that MP1/p14, together with profilins, define a protein, superfamily of small subcellular adaptor proteins, named ProflAP. Taken, together, the presented work provides insight into the spatial regulation, of MAPK signaling, illustrating how p14 and MP1 collaborate as an, endosomal adaptor/scaffold complex.
About this Structure
1VET is a Protein complex structure of sequences from Mus musculus. Full crystallographic information is available from OCA.
Reference
Crystal structure of the p14/MP1 scaffolding complex: how a twin couple attaches mitogen-activated protein kinase signaling to late endosomes., Kurzbauer R, Teis D, de Araujo ME, Maurer-Stroh S, Eisenhaber F, Bourenkov GP, Bartunik HD, Hekman M, Rapp UR, Huber LA, Clausen T, Proc Natl Acad Sci U S A. 2004 Jul 27;101(30):10984-9. Epub 2004 Jul 19. PMID:15263099
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