Abstract:
:Neu2 mRNA from the mouse thymus, as we have reported [K. Kotani, A. Kuroiwa, T. Saito, Y. Matsuda, T. Koda, S. Kijimoto-Ochiai, Cloning, chromosomal mapping, and characteristic 5'-UTR sequence of murine cytosolic sialidase, Biochem. Biophys. Res. Commun. 286 (2001) 250-258], has a novel sequence at the 5' terminus that shows the ability to encode 6 extra amino acids in the N-terminus than that of the muscle. In this paper, we analyzed the cDNA and EST database and found the five types of alternative splicing of Neu2 mRNA: A, B, C, D and N. We studied the expression of these types in the immune tissues and found that the thymus expressed only type B. We constructed 2 types of plasmid that encode long (B) or short (C) form of Neu2 protein, and transfected them into COS7 cells to study them under the same conditions. We found that 30-40% of the both forms of Neu2 activity was located in the crude membrane-fraction, and hydrolyzed ganglioside effectively, while both soluble fraction showed particular behavior with substrate specificity. Microscopic study by active staining with X-NANA showed that they located not only in the cytoplasm but also in areas surrounding the nucleus and in the peripheral ruffled spot.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Koda T,Kijimoto-Ochiai S,Uemura S,Inokuchi Jdoi
10.1016/j.bbrc.2009.07.100subject
Has Abstractpub_date
2009-10-02 00:00:00pages
729-35issue
4eissn
0006-291Xissn
1090-2104pii
S0006-291X(09)01460-0journal_volume
387pub_type
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