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Glycobiology Advance Access published online on July 13, 2005

Glycobiology, doi:10.1093/glycob/cwj008
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org
Received April 25, 2005
Revised July 2, 2005
Accepted July 2, 2005

Article

Siglecs - the Major Sub-family of I-type Lectins

Ajit Varki 1* and Takashi Angata 2

1 Departments of Medicine and Cellular & Molecular Medicine Glycobiology Research and Training Center, University of California, San Diego, La Jolla, CA 92093, USA
2 Research Center for Glycoscience, National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan

* To whom correspondence should be addressed.
Ajit Varki, E-mail: varkiadmin{at}ucsd.edu


   Abstract

Animal glycan-recognizing proteins can be broadly classified into two groups - lectins (which typically contain an evolutionarily conserved carbohydrate-recognition domain); and sulfated glycosaminoglycan-binding proteins (which appear to have evolved by convergent evolution). Proteins other than antibodies and T cell receptors that mediate glycan recognition via immunoglobulin (Ig)-like domains are called ‘I-type lectins’. The major homologous subfamily of I-type lectins with sialic acid binding properties and characteristic amino-terminal structural features are called the ‘Siglecs’ (Sialic acid-recognizing Ig-superfamily lectins). The Siglecs can be divided into two groups: an evolutionarily conserved sub-group (Siglecs-1, -2 and -4); and a CD33/Siglec 3-related sub-group (Siglecs 3 and 5-13 in primates), which appear to be rapidly evolving. This paper provides an overview of historical and current information about the Siglecs.


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