1ou8
From Proteopedia
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| , resolution 1.60Å | |||||||
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| Ligands: | |||||||
| Gene: | SSPB (Haemophilus influenzae) | ||||||
| Related: | 1OU9, 1OUL
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| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||
structure of an AAA+ protease delivery protein in complex with a peptide degradation tag
Overview
Substrate selection by AAA+ ATPases that function to unfold proteins or alter protein conformation is often regulated by delivery or adaptor proteins. SspB is a protein dimer that binds to the ssrA degradation tag and delivers proteins bearing this tag to ClpXP, an AAA+ protease, for degradation. Here, we describe the structure of the peptide binding domain of H. influenzae SspB in complex with an ssrA peptide at 1.6 A resolution. The ssrA peptides are bound in well-defined clefts located at the extreme ends of the SspB homodimer. SspB contacts residues within the N-terminal and central regions of the 11 residue ssrA tag but leaves the C-terminal residues exposed and positioned to dock with ClpX. This structure, taken together with biochemical analysis of SspB, suggests mechanisms by which proteins like SspB escort substrates to AAA+ ATPases and enhance the specificity and affinity of target recognition.
About this Structure
1OU8 is a Single protein structure of sequence from Haemophilus influenzae. Full crystallographic information is available from OCA.
Reference
Structure of a delivery protein for an AAA+ protease in complex with a peptide degradation tag., Levchenko I, Grant RA, Wah DA, Sauer RT, Baker TA, Mol Cell. 2003 Aug;12(2):365-72. PMID:14536076
Page seeded by OCA on Sun Mar 30 22:50:27 2008
