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- W1995571420 abstract "Larvae of the beetle Dendroides canadensis produce a family of 13 antifreeze proteins (DAFPs), four of which are in the hemolymph. Antifreeze proteins lower the noncolligative freezing point of water (in the presence of ice) below the melting point, producing a difference between the freezing and melting points termed thermal hysteresis. This activity (THA) is dependent upon DAFP specific activity, concentration, and the presence of enhancers. Enhancers may be low molecular mass enhancers, such as glycerol, or other proteins. The protein enhancers complex with the DAFPs, thereby blocking a larger surface area of the potential seed ice crystal and consequently lowering the freezing point. A yeast two-hybrid screen was performed using certain hemolymph DAFPs as “bait” in an effort to identify endogenous protein enhancers. Among the positive proteins identified as interacting with the bait DAFPs, and confirmed by co-immunoprecipitation, were other DAFPs. When pure DAFPs were added to one another, those identified by the yeast two-hybrid screen as interacting with one another exhibited a synergistic enhancement of thermal hysteresis activity. In contrast, those DAFPs which the screen indicated did not interact failed to enhance one anothers' activities. DAFPs-1 and -2 interact and enhance one another. Point mutations of one of the interacting DAFPs (DAFP-2) indicated that both of the two amino acid residues that differ between DAFPs-1 and -2 were required for interaction. Glycerol enhanced the THA of the DAFPs only when DAFPs known to interact were present in the test solution. Addition of glycerol to a test solution containing only one DAFP did not produce enhancement. Therefore, glycerol enhances activity by stimulating interactions between DAFPs." @default.
- W1995571420 created "2016-06-24" @default.
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- W1995571420 date "2005-07-08" @default.
- W1995571420 modified "2023-10-15" @default.
- W1995571420 title "Antifreeze Proteins of the Beetle <i>Dendroides canadensis</i> Enhance One Another's Activities" @default.
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- W1995571420 doi "https://doi.org/10.1021/bi050728y" @default.
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