A C-terminal phosphatase module conserved in vertebrate CMP-sialic acid synthetases provides a tetramerization interface for the physiologically active enzyme.
Oschlies, M., Dickmanns, A., Haselhorst, T., Schaper, W., Stummeyer, K., Tiralongo, J., Weinhold, B., Gerardy-Schahn, R., von Itzstein, M., Ficner, R., Munster-Kuhnel, A.K.(2009) J Mol Biol 393: 83-97
- PubMed: 19666032 
- DOI: 10.1016/j.jmb.2009.08.003
- Primary Citation of Related Structures:  
3EWI - PubMed Abstract: 
The biosynthesis of sialic acid-containing glycoconjugates is crucial for the development of vertebrate life. Cytidine monophosphate-sialic acid synthetase (CSS) catalyzes the metabolic activation of sialic acids. In vertebrates, the enzyme is chimeric, with the N-terminal domain harboring the synthetase activity ...