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J. Biochem, 1998, Vol. 123, No. 6 1164-1168
© 1998 Japanese Biochemical Society

research-article

Development-Dependent Expression of Complex-Type Sugar Chains Specific to Mouse Brain

Shin-ichi Nakakita*, Shunji Natsuka*, Kazuhiro Ikenaka{dagger} and Sumihiro Hase*,1

*Department of Chemistry, Graduate School of Science, Osaka University 1-1 Machikaneyama, Toyonaka, Osaka 560
{dagger}National Institute for Physiological Sciences, Okazaki National Research Institutes Okazaki, Aichi 444

1To whom correspondence should be addressed. Fax: +81-6-850-5383

We previously detected a fucosylagalactobiantenna with a bisecting GlcNAc residue (BA-2) and one lacking the GlcNAc residue linked to the Manal-3 residue of BA-2 (BA-1), which were enriched specifically in mouse brain [Shimizu, H., Ochiai, K., Ikenaka, K., Mikoshiba, K., and Hase, S. (1993) J. Biochem. 114, 334–338]. Pyridylamino sugar chains were prepared from mouse brains of various ages, and BA-1 and BA-2 were quantified after separation by HPLC. In cerebrum, BA-1 was scarcely expressed in newborn brain but gradually increased in amount during development, while expression of BA-2 reached a maximum 1 week after birth followed by a rapid decrease; in adult mice, the amount of BA-1 was almost the same as that of BA-2. In cerebellum, expression of BA-1 was lower than that of BA-2 at all stages. Glycoproteins with the BA-1 and BA-2 structures were enriched in the membrane fraction, and the glycoproteins solubilized were purified by lectin-affinity chromatography and gel filtration. The results indicated that BA-1 and BA-2 occurred in glycoproteins of more than 20 kDa in cerebellum, but most BA-1 and BA-2 were found in a 80–200 kDa fraction in cerebrum. These results show that the two brain-specific sugar chains are developmentally regulated and linked to the membrane-associated glycoproteins of subcellular organellas.


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