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Extracellular Proteome Changes of Deinococcus radiodurans Under γ-Irradiation Stress Conditions

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To analysis the change of Deinococcus radiodurans extracellular proteins recovering from γ-irradiation, we examined extracellular proteome changes using two-dimensional polyacrylamide gel electrophoresis. Twenty-six spots on the gel of irradiated sample were showed significant changes compared with spots on the control gel. Using peptide mass fingerprinting via matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF-MS), 21 different proteins could be distinguished. Among the identified proteins, seven are classified in transport and metabolism, and one is involved in intracellular trafficking and secretion. The other proteins are known to several functions in the cytosol. Most of the proteins have not previously been reported to be relevant to radioresistance. These results imply that the transmembrane transportation is involved in and contributes to the radioresistance in this organism.

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Keywords: Deinococccus radiodurans; Extracellular proteomics; ionizing radiation; mass spectrometry; two-dimensional gel electrophoresis

Document Type: Research Article

Publication date: 2008-07-01

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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