2joa
From Proteopedia
| Line 1: | Line 1: | ||
[[Image:2joa.jpg|left|200px]] | [[Image:2joa.jpg|left|200px]] | ||
| - | + | <!-- | |
| - | + | The line below this paragraph, containing "STRUCTURE_2joa", creates the "Structure Box" on the page. | |
| - | + | You may change the PDB parameter (which sets the PDB file loaded into the applet) | |
| - | + | or the SCENE parameter (which sets the initial scene displayed when the page is loaded), | |
| - | + | or leave the SCENE parameter empty for the default display. | |
| - | + | --> | |
| - | + | {{STRUCTURE_2joa| PDB=2joa | SCENE= }} | |
| - | + | ||
| - | + | ||
| - | }} | + | |
'''HtrA1 bound to an optimized peptide: NMR assignment of PDZ domain and ligand resonances''' | '''HtrA1 bound to an optimized peptide: NMR assignment of PDZ domain and ligand resonances''' | ||
| Line 34: | Line 31: | ||
[[Category: Wu, P.]] | [[Category: Wu, P.]] | ||
[[Category: Zhang, Y.]] | [[Category: Zhang, Y.]] | ||
| - | [[Category: | + | [[Category: Beta-sandwich]] |
| - | [[Category: | + | [[Category: Cyclically-permuted]] |
| - | [[Category: | + | [[Category: Pdz]] |
| - | [[Category: | + | [[Category: Protein binding]] |
| - | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 09:06:13 2008'' | |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | + | |
Revision as of 06:06, 4 May 2008
HtrA1 bound to an optimized peptide: NMR assignment of PDZ domain and ligand resonances
Overview
High-temperature requirement A (HtrA) and its homologs contain a serine protease domain followed by one or two PDZ domains. Bacterial HtrA proteins and the mitochondrial protein HtrA2/Omi maintain cell function by acting as both molecular chaperones and proteases to manage misfolded proteins. The biological roles of the mammalian family members HtrA1 and HtrA3 are less clear. We report a detailed structural and functional analysis of the PDZ domains of human HtrA1 and HtrA3 using peptide libraries and affinity assays to define specificity, structural studies to view the molecular details of ligand recognition, and alanine scanning mutagenesis to investigate the energetic contributions of individual residues to ligand binding. In common with HtrA2/Omi, we show that the PDZ domains of HtrA1 and HtrA3 recognize hydrophobic polypeptides, and while C-terminal sequences are preferred, internal sequences are also recognized. However, the details of the interactions differ, as different domains rely on interactions with different residues within the ligand to achieve high affinity binding. The results suggest that mammalian HtrA PDZ domains interact with a broad range of hydrophobic binding partners. This promiscuous specificity resembles that of bacterial HtrA family members and suggests a similar function for recognizing misfolded polypeptides with exposed hydrophobic sequences. Our results support a common activation mechanism for the HtrA family, whereby hydrophobic peptides bind to the PDZ domain and induce conformational changes that activate the protease. Such a mechanism is well suited to proteases evolved for the recognition and degradation of misfolded proteins.
About this Structure
2JOA is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structural and functional analysis of the PDZ domains of human HtrA1 and HtrA3., Runyon ST, Zhang Y, Appleton BA, Sazinsky SL, Wu P, Pan B, Wiesmann C, Skelton NJ, Sidhu SS, Protein Sci. 2007 Nov;16(11):2454-71. PMID:17962403 Page seeded by OCA on Sun May 4 09:06:13 2008
