Sialobiology: Structure, Biosynthesis and Function Sialic Acid Glycoconjugates in Health and Disease


Joe Tiralongo, Ivan Martinez-Duncker

DOI: 10.2174/97816080538651130101
eISBN: 978-1-60805-386-5, 2013
ISBN: 978-1-60805-067-3

Indexed in: Book Citation Index, Science Edition, BIOSIS Previews, Scopus, EBSCO.

This eBook presents a summary of central aspects of sialobiology (i.e., the study of sialic acid and its relevance to biology). The im...[view complete introduction]
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Polysialic Acid

- Pp. 33-75 (43)

Chihiro Sato


Sialic acids (Sia) are involved in many biological activities and are commonly present as monosialyl residues at the non-reducing terminal end of glycoconjugates. Occasionally, polymerized structures in the form of disialic acid (diSia), oligosialic acid (oligoSia), and polysialic acid (polySia) appear in glycoconjugates. In particular, polySia is known to be a common epitope from bacteria to humans and is one of the most famous, biologically-important glycotopes in vertebrates. The biological functions of polySia, especially on neural cell adhesion molecules (NCAMs), have been well studied and an indepth body of knowledge concerning polySia has been accumulated. However, considerably less attention has been paid to glycoproteins containing di- and oligoSia groups. As the analytical methods used to detect oligo/polymerized structures have been improved, glycoproteins containing di/oligo/polySia chains have been identified with an increasing frequency in nature. In addition, more sophisticated genetic techniques have helped elucidate the underlying mechanisms of polySia-mediated activities. In this chapter, the recent advances in the study of di-, oligo- and polySia residues on glycoproteins, including their distribution, chemical properties, biosynthetic pathways, and functions are described.

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