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| {{STRUCTURE_1l7j| PDB=1l7j | SCENE= }} | | {{STRUCTURE_1l7j| PDB=1l7j | SCENE= }} |
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| '''X-ray structure of galactose mutarotase from Lactococcus lactis (apo)'''
| | ===X-ray structure of galactose mutarotase from Lactococcus lactis (apo)=== |
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| ==Overview==
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| Galactose mutarotase plays a key role in normal galactose metabolism by catalyzing the interconversion of beta-D-galactose and alpha-D-galactose. Here we describe the three-dimensional architecture of galactose mutarotase from Lactococcus lactis determined to 1.9-A resolution. Each subunit of the dimeric enzyme displays a distinctive beta-sandwich motif. This tertiary structural element was first identified in beta-galactosidase and subsequently observed in copper amine oxidase, hyaluronate lyase, chondroitinase, and maltose phosphorylase. Two cis-peptides are found in each subunit, namely Pro(67) and Lys(136). The active site is positioned in a rather open cleft, and the electron density corresponding to the bound galactose unequivocally demonstrates that both anomers of the substrate are present in the crystalline enzyme. Those residues responsible for anchoring the sugar to the protein include Arg(71), His(96), His(170), Asp(243), and Glu(304). Both His(96) and His(170) are strictly conserved among mutarotase amino acid sequences determined thus far. The imidazole nitrogens of these residues are located within hydrogen bonding distance to the C-5 oxygen of galactose. Strikingly, the carboxylate group of Glu(304) is situated at approximately 2.7 A from the 1'-hydroxyl group of galactose, thereby suggesting its possible role as a general acid/base group.
| | The line below this paragraph, {{ABSTRACT_PUBMED_11907040}}, adds the Publication Abstract to the page |
| | (as it appears on PubMed at http://www.pubmed.gov), where 11907040 is the PubMed ID number. |
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| | {{ABSTRACT_PUBMED_11907040}} |
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| ==About this Structure== | | ==About this Structure== |
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| [[Category: Galactose metabolism]] | | [[Category: Galactose metabolism]] |
| [[Category: Mutarotase]] | | [[Category: Mutarotase]] |
| ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 23:37:57 2008'' | | |
| | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Wed Jul 2 11:52:51 2008'' |
