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2b5r
From Proteopedia
| 2b5r, resolution 1.65Å () | |||||||||
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| Gene: | bla (Escherichia coli) | ||||||||
| Activity: | Beta-lactamase, with EC number 3.5.2.6 | ||||||||
| Domains: | PenP, BLIP | ||||||||
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| Resources: | FirstGlance, OCA, PDBsum, RCSB, TOPSAN | ||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||
TEM1-β-Lactamase/ β-Lactamase Inhibitor Protein (BLIP)
(see also TEM1-beta-Lactamase/beta-lactamase Inhibitor Protein (BLIP))
Proteins bind one another in aqua's solution to form tight and specific complexes. Previously we have shown that this is achieved through the modular architecture of the interaction network formed by the interface residues, where tight cooperative interactions are found within modules but not between them. Here we extend this study to cover the entire interface of TEM1 beta-lactamase and its protein inhibitor BLIP using an improved method for deriving interaction maps based on REDUCE to add hydrogen atoms and then by evaluating the interactions using modifications of the programs PROBE, NCI and PARE. An extensive mutagenesis study of the interface residues indeed showed that each module is energetically independent on other modules, and that cooperativity is found only within a module. By solving the X-ray structure of two interface mutations affecting two different modules, we demonstrated that protein-protein binding occur via the structural reorganization of the binding modules, either by a "lock and key" or an induced fit mechanism. To explain the cooperativity within a module, we performed multiple-mutant cycle analysis of cluster 2 resulting in a high-resolution energy map of this module. Mutant studies are usually done in reference to alanine, which can be regarded as a deletion of a side-chain. However, from a biological perspective, there is a major interest to understand non-Ala substitutions, as they are most common. Using X-ray crystallography and multiple-mutant cycle analysis we demonstrated the added complexity in understanding non-Ala mutations. Here, a double mutation replacing the wild-type Glu,Tyr to Tyr,Asn on TEM1 (res id 104,105) caused a major backbone structural rearrangement of BLIP, changing the composition of two modules but not of other modules within the interface. This shows the robustness of the modular approach, yet demonstrates the complexity of in silico protein design.
Binding hot spots in the TEM1-BLIP interface in light of its modular architecture., Reichmann D, Cohen M, Abramovich R, Dym O, Lim D, Strynadka NC, Schreiber G, J Mol Biol. 2007 Jan 19;365(3):663-79. Epub 2006 Oct 3. PMID:17070843
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
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About this Structure
2B5R is a Protein complex structure of sequences from Escherichia coli and Streptomyces clavuligerus. Full crystallographic information is available from OCA.
References
- Reichmann D, Cohen M, Abramovich R, Dym O, Lim D, Strynadka NC, Schreiber G. Binding hot spots in the TEM1-BLIP interface in light of its modular architecture. J Mol Biol. 2007 Jan 19;365(3):663-79. Epub 2006 Oct 3. PMID:17070843 doi:10.1016/j.jmb.2006.09.076
- Strynadka NC, Jensen SE, Johns K, Blanchard H, Page M, Matagne A, Frere JM, James MN. Structural and kinetic characterization of a beta-lactamase-inhibitor protein. Nature. 1994 Apr 14;368(6472):657-60. PMID:8145854 doi:10.1038/368657a0
Page seeded by OCA on Sun Jul 27 19:43:48 2008
