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  • Title: Molecular cloning and response to laminarin stimulation of arginine kinase in haemolymph in Chinese shrimp, Fenneropenaeus chinensis.
    Author: Yao CL, Wu CG, Xiang JH, Dong B.
    Journal: Fish Shellfish Immunol; 2005 Oct; 19(4):317-29. PubMed ID: 15863013.
    Abstract:
    Arginine kinase (AK) was previously reported as a phosphagen-ATP phosphotransferase found in invertebrates. In this study, an 1184 bp cDNA was cloned and sequenced. It contained an open reading frame of 1068 bp that coded for 356 deduced amino acids of AK in Fenneropenaeus chinensis. The calculated molecular mass of AK is 40129.73 Da and pI is 5.92. The predicted protein showed a high level of identity to known AK in invertebrates and creatine kinase from vertebrates, which belong to a conserved family of ATP:guanidino phospho-transferases. In addition, AK protein in plasma of F. chinensis was identified using two-dimensional electrophoresis (2DE) and electrospray ionization mass spectrometry (ESI-MS) according to the calculated molecular mass and pI. AK was significantly decreased in the plasma of F. chinensis at 45 min and recovered at 3 h after laminarin injection as confirmed by 2DE and ESI-MS. The results showed that AK was one of the most significantly changed proteins on two-dimensional gel in the plasma proteins of F. chinensis at 45 min and 3 h after simulation.
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