title: A novel cryoprotective protein (CRP) with high activity from the ice-nucleating bacterium, Pantoea agglomerans IFO12686.
abstract: The ice-nucleating bacterium, Pantoea agglomerans IFO12686, induces the cryoprotective protein (CRP) by cold acclimation at 12 degrees C. The CRP was purified to apparent homogeneity by various chromatographies. We found that the purified CRP was a monomer of approximately 29,000 according to gel filtration chromatography and SDS-PAGE, and was a heat-stable protein. The CRP could protect freeze-labile enzymes, lactate dehydrogenase (LDH), alcohol dehydrogenase (ADH) and isocitrate dehydrogenase (iCDH), against freezing-thawing denaturation. The activity of the CRP was about 3.5 x 10(4) times more effective than bovine serum albumin (BSA) and 2 x 10(6) times than COR26 from the ice-nucleating bacterium Pseudomonas fluorescens KUIN-1. We confirmed that the CRP was a novel protein, as judged by the a different molecule mass from the already-known cryoprotectants, and has an extremely high cryoprotective activity.
authors.affiliation: Department of Biotechnology, Faculty of Engineering, and High Technology Research Center, Kansai University, Suita-shi, Osaka, Japan. gm9d605@ipcku.kansai-u.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Koda
authors.forename: T
authors.initials: T
authors.lastname: Asaeda
authors.forename: K
authors.initials: K
authors.lastname: Yamade
authors.forename: H
authors.initials: H
authors.lastname: Kawahara
authors.forename: H
authors.initials: H
authors.lastname: Obata
mesh_terms: D000645:Ammonium Sulfate / Q000494:pharmacology; D001426:Bacterial Proteins / Q000302:isolation & purification* / Q000494:pharmacology; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D003451:Cryoprotective Agents / Q000302:isolation & purification* / Q000494:pharmacology; D004591:Electrophoresis, Polyacrylamide Gel; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007770:L-Lactate Dehydrogenase / Q000737:chemistry / Q000378:metabolism; D008970:Molecular Weight; D020636:Pantoea / Q000737:chemistry*; D011489:Protein Denaturation / Q000187:drug effects*; D013307:Streptomycin / Q000494:pharmacology
chemical_list: D001426:Bacterial Proteins; D003451:Cryoprotective Agents; D007770:L-Lactate Dehydrogenase; D000645:Ammonium Sulfate; D013307:Streptomycin