Difference between revisions of "Template:2011/Team:Amsterdam/Cpn60 10"
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''Cpn10'' and ''Cpn60'' are homologous to ''GroES'' and ''GroEL'' of ''E. coli'', respectively. The ''GroEL/ES'' chaperone system promotes the folding and/or assembly of over 30% of ''E. coli'''s cellular proteins, is required for bacteriophage morphogenesis and has a role in protein secretion.[http://www.nature.com/nature/journal/v355/n6355/abs/355033a0.html][http://onlinelibrary.wiley.com/doi/10.1002/1521-3773%2820020402%2941:7%3C1098::AID-ANIE1098%3E3.0.CO;2-9/abstract] However, it rapidly loses its refolding activity at temperatures below 37°C.[http://www.nature.com/nbt/journal/v21/n11/pdf/nbt1103-1266b.pdf] (Figure 1b) ''Cpn60/10'', on the other hand, functions very well at these temperatures. | ''Cpn10'' and ''Cpn60'' are homologous to ''GroES'' and ''GroEL'' of ''E. coli'', respectively. The ''GroEL/ES'' chaperone system promotes the folding and/or assembly of over 30% of ''E. coli'''s cellular proteins, is required for bacteriophage morphogenesis and has a role in protein secretion.[http://www.nature.com/nature/journal/v355/n6355/abs/355033a0.html][http://onlinelibrary.wiley.com/doi/10.1002/1521-3773%2820020402%2941:7%3C1098::AID-ANIE1098%3E3.0.CO;2-9/abstract] However, it rapidly loses its refolding activity at temperatures below 37°C.[http://www.nature.com/nbt/journal/v21/n11/pdf/nbt1103-1266b.pdf] (Figure 1b) ''Cpn60/10'', on the other hand, functions very well at these temperatures. | ||
| − | Ferrer ''et al.'' identified 22 housekeeping proteins involved with ''E. coli'' 's systems failure at low temperatures. They went on to demonstrate their interactions with chaperones are key determinants of activity at these temperatures. It was shown that the ''Cpn60'' protein from ''O. antarctica'' coprecipitates with many of the proteins found in the proteome of ''E. coli''.[http://onlinelibrary.wiley.com/doi/10.1002/pmic.200500031/abstract] Also, by transforming ''E. coli'' with ''Cpn10'' and ''Cpn60'', they've enabled it to grow even at freezing point. (Figure 1a) Their findings suggest inactivation of a few cold-sensitive key causes systems failure in ''E. coli'', and that cells may be 'rescued' by reactivating these genes. | + | Ferrer ''et al.'' identified 22 housekeeping proteins involved with ''E. coli'' 's systems failure at low temperatures. They went on to demonstrate their interactions with chaperones are key determinants of activity at these temperatures. It was shown that the ''Cpn60'' protein from ''O. antarctica'' coprecipitates with many of the proteins found in the proteome of ''E. coli''.[http://onlinelibrary.wiley.com/doi/10.1002/pmic.200500031/abstract] Also, by transforming ''E. coli'' with ''Cpn10'' and ''Cpn60'', they've enabled it to grow even at freezing point. (Figure 1a) Their findings suggest inactivation of a few cold-sensitive key proteins causes systems failure in ''E. coli'', and that cells may be 'rescued' by reactivating these genes. |
Revision as of 05:32, 21 September 2011
Biology
Cpn10 and Cpn60 are homologous to GroES and GroEL of E. coli, respectively. The GroEL/ES chaperone system promotes the folding and/or assembly of over 30% of E. coli's cellular proteins, is required for bacteriophage morphogenesis and has a role in protein secretion.[http://www.nature.com/nature/journal/v355/n6355/abs/355033a0.html][http://onlinelibrary.wiley.com/doi/10.1002/1521-3773%2820020402%2941:7%3C1098::AID-ANIE1098%3E3.0.CO;2-9/abstract] However, it rapidly loses its refolding activity at temperatures below 37°C.[http://www.nature.com/nbt/journal/v21/n11/pdf/nbt1103-1266b.pdf] (Figure 1b) Cpn60/10, on the other hand, functions very well at these temperatures.
Ferrer et al. identified 22 housekeeping proteins involved with E. coli 's systems failure at low temperatures. They went on to demonstrate their interactions with chaperones are key determinants of activity at these temperatures. It was shown that the Cpn60 protein from O. antarctica coprecipitates with many of the proteins found in the proteome of E. coli.[http://onlinelibrary.wiley.com/doi/10.1002/pmic.200500031/abstract] Also, by transforming E. coli with Cpn10 and Cpn60, they've enabled it to grow even at freezing point. (Figure 1a) Their findings suggest inactivation of a few cold-sensitive key proteins causes systems failure in E. coli, and that cells may be 'rescued' by reactivating these genes.
Characterisation
Ferrer et al. have already shown the Cpn60/10 system to have a nameworthy impact on E. coli's cold tolerance. It is currently being investigated whether or not the CryoBricks comprising BBa_K538000 and BBa_K538001 reproduce this effect.
[Update pending; waiting for lab results]
In case the chaperones' effect on growth rate at low temperatures is reproducible, team [http://2011.igem.org/Team:Amsterdam Amsterdam] expects a similar result when transforming related species with their CryoBricks. If systems failure is caused by inactivation of genes like Dps, ClpB, DnaK and RpsB (or their homologs), Cpn60/10 might be able to recover their activity. This brick's developers had intended to investigate this in some bacterial species, but constraints on time made this unfeasible.
Safety
There are risks involved with enhancing bacterial cold resistance and facilitating their growth at low temperatures. Please refer to the [http://2011.igem.org/Team:Amsterdam/Project/Safety safety page] of this brick's developers.
References
- Gething & Sambrook Protein folding in the cell, Nature 355, 33–45 (1992)
- Walter & Buchner Molecular Chaperones — Cellular Machines for Protein Folding, Angew. Chem. Int. Ed. Eng. 41, 1098–1113 (2002)
- Ferrer et al. Chaperonins govern growth of Escherichia coli at low temperatures, Nat. Biotech. 21, 1266 - 1267 (2003)
- Strocchi, Ferrer, Timmis & Golyshin Low temperature-induced systems failure in Escherichia coli: Insights from rescue by cold-adapted chaperones, Proteomics 6 (1), 193-206 (2005)