1nf5

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Template:STRUCTURE 1nf5

Contents 1 Crystal Structure of Lactose Synthase, Complex with Glucose 2 Function 3 About this Structure 4 See Also 5 Reference

Crystal Structure of Lactose Synthase, Complex with Glucose

Template:ABSTRACT PUBMED 11419947

Function

[LALBA_MOUSE] Regulatory subunit of lactose synthase, changes the substrate specificity of galactosyltransferase in the mammary gland making glucose a good acceptor substrate for this enzyme. This enables LS to synthesize lactose, the major carbohydrate component of milk. In other tissues, galactosyltransferase transfers galactose onto the N-acetylglucosamine of the oligosaccharide chains in glycoproteins. [B4GT1_BOVIN] The Golgi complex form catalyzes the production of lactose in the lactating mammary gland and could also be responsible for the synthesis of complex-type N-linked oligosaccharides in many glycoproteins as well as the carbohydrate moieties of glycolipids. The cell surface form functions as a recognition molecule during a variety of cell to cell and cell to matrix interactions, as those occurring during development and egg fertilization, by binding to specific oligosaccharide ligands on opposing cells or in the extracellular matrix.

About this Structure

1nf5 is a 4 chain structure with sequence from Bos taurus and Mus musculus. This structure supersedes the now removed PDB entry 1j8w. Full crystallographic information is available from OCA.

See Also

• Glycosyltransferase
• Lactalbumin

Reference

• Ramakrishnan B, Qasba PK. Crystal structure of lactose synthase reveals a large conformational change in its catalytic component, the beta1,4-galactosyltransferase-I. J Mol Biol. 2001 Jun 29;310(1):205-18. PMID:11419947 doi:http://dx.doi.org/10.1006/jmbi.2001.4757