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Evidence for aestivation specific proteins inOtala lactea

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Abstract

Changes in [35S]methionine protein labeling patterns were examined by following incorporation into the acid precipitate protein fraction of land snails,Otala lactea (Müller) (Pulmonata, Helicidae). Labeled proteins were analyzed by SDS polyacrylamide gel electrophoresis and isoelectric focusing columns. Snails in four different physiological states were compared: active controls, short term aestivating snails (injected and allowed to enter aestivation), long term aestivating snails (aestivated for 14 days, injected, and maintained in the aestivating state), and snails aroused after aestivation (aestivated, injected, and aroused). Protein associated radioactivity was measured over a 7 day time course post injection. Autoradiographic analysis of SDS-polyacrylamide gels showed increases in the radioactivity of four proteins: 91 kDa (hepatopancreas, day 1 in long term aestivating animals), 50 kDa (hepatopancreas, day 2 in short term aestivating snails), 70 kDa and 30 kDa (foot, day 2 in short term aestivating animals). Hepatopancreas and foot from day 1 long term aestivating and day 2 short term aestivating animals were also analyzed by isoelectric focusing columns. Several pH-specific differences were apparent when controls and aestivating animals were analyzed. In particular a peak of radioactivity was observed at pH 5.05 in 1 d long term aestivating hepatopancreas and at pH 4.30 in 2d short term aestivating animals. Several differences were noted in foot with no specific pattern emerging. SDS-polyacrylamide gel electrophoresis analysis of the hepatopancreas peaks showed the appearance of several bands with increased radioactivity, including the 91 kDa and 50 kDa proteins described above. These results suggest thatO. lactea aestivation specific proteins may be involved in the transition to a depressed metabolic state.

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Abbreviations

dpm:

radioactive disintegrations per minute

PAGE:

polyacrylamide gel electrophoresis

SDS:

sodium dodecyl sulphate

SRP:

stress related protein

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Brooks, S.P.J., Storey, K.B. Evidence for aestivation specific proteins inOtala lactea . Mol Cell Biochem 143, 15–20 (1995). https://doi.org/10.1007/BF00925922

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