NDLI: The homologue of mannose-binding lectin in the carp family Cyprinidae is expressed at high level in spleen, and the deduced primary structure predicts affinity for galactose

Content Provider	Springer Nature Link
Author	Vitved, Lars Holmskov, Uffe Koch, Claus Teisner, Børge Hansen, Søren Skjødt, Karsten
Copyright Year	2000
Abstract	Mannose-binding lectin (MBL) participates in the innate immune system as an activator of the complement system and as an opsonin after binding to certain carbohydrate structures on microorganisms. We isolated and characterized cDNA transcripts encoding an MBL homologue from three members of the carp family Cyprinidae, the zebrafish Danio rerio, the goldfish Carassius auratus, and the carp Cyprinus carpio. The carp and zebrafish transcripts contain two polyadenylation sites and RT-PCR on mRNA from carp tissues revealed the carp transcript to be most prominently expressed in the spleen. The deduced mature proteins contain 228 or 233 amino acids with a short N-terminal segment containing a single conserved cysteine expected to form interchain disulfide bridges, a collagen domain interrupted by four amino acids between two glycine residues, a neck region predicted to form an α-helical coiled-coil structure, and a C-terminal carbohydrate recognition domain (CRD). Several of the structurally important residues in the CRD are conserved, but the residues known to interact with the calcium ion and hydroxyl groups of the carbohydrate ligand are different. The amino acid motif EPN, important for mannose specificity, was QPD in the Cyprinidae homologue, suggesting specificity for galactose instead. The identity between the deduced amino acid sequences is more than 90% between the carp and the goldfish and 68% and 65% between these two species, respectively, and the zebrafish. The identity with bird and mammalian MBLs ranges from 28 to 33%.
Starting Page	955
Ending Page	964
Page Count	10
File Format	PDF
ISSN	00937711
Journal	Immunogenetics
Volume Number	51
Issue Number	11
e-ISSN	14321211
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-08-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Genetics Immunology

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