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CMP-N-acetylneuraminic Acid Hydroxylase Activity Determines the Wheat Germ Agglutinin-binding Phenotype in Two Mutants of the Lymphoma Cell Line MDAY-D2

Overview
Journal Glycoconj J
Publisher Springer
Date 1991 Oct 1
PMID 1841685
Citations 6
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Abstract

The dominant glycosylation mutants of MDAY-D2 mouse lymphoma cells, designated class 2 (D33W25 and D34W25) were selected for their resistance to the toxic effects of wheat germ agglutinin (WGA) and shown to express elevated levels of Neu5Gc. In accordance with this, the activity of CMP-Neu5Ac hydroxylase was found to be substantially higher in the mutant cells. The hydroxylase in the D33W25 mutant cells exhibited kinetic properties identical to those of the same enzyme from mouse liver. Growth rate experiments in vivo and in vitro, where the mutant cells grew more slowly at low cell densities in serum-free medium and also formed slower growing tumours in syngeneic mice, indicate that CMP-Neu5Ac hydroxylase expression may be associated with altered growth of the mutant cells.

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