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2a2d

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{{STRUCTURE_2a2d| PDB=2a2d | SCENE= }}
{{STRUCTURE_2a2d| PDB=2a2d | SCENE= }}
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'''X-ray structure of human n-acetyl galactosamine kinase complexed with Mn-AMPPNP and n-acetyl glactosamine'''
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===X-ray structure of human n-acetyl galactosamine kinase complexed with Mn-AMPPNP and n-acetyl glactosamine===
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==Overview==
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Galactokinase plays a key role in normal galactose metabolism by catalyzing the conversion of alpha-d-galactose to galactose 1-phosphate. Within recent years, the three-dimensional structures of human galactokinase and two bacterial forms of the enzyme have been determined. Originally, the gene encoding galactokinase in humans was mapped to chromosome 17. An additional gene, encoding a protein with sequence similarity to galactokinase, was subsequently mapped to chromosome 15. Recent reports have shown that this second gene (GALK2) encodes an enzyme with greater activity against GalNAc than galactose. This enzyme, GalNAc kinase, has been implicated in a salvage pathway for the reutilization of free GalNAc derived from the degradation of complex carbohydrates. Here we report the first structural analysis of a GalNAc kinase. The structure of the human enzyme was solved in the presence of MnAMPPNP and GalNAc or MgATP and GalNAc (which resulted in bound products in the active site). The enzyme displays a distinctly bilobal appearance with its active site wedged between the two domains. The N-terminal region is dominated by a seven-stranded mixed beta-sheet, whereas the C-terminal motif contains two layers of anti-parallel beta-sheet. The overall topology displayed by GalNAc kinase places it into the GHMP superfamily of enzymes, which generally function as small molecule kinases. From this investigation, the geometry of the GalNAc kinase active site before and after catalysis has been revealed, and the determinants of substrate specificity have been defined on a molecular level.
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(as it appears on PubMed at http://www.pubmed.gov), where 16006554 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16006554}}
==About this Structure==
==About this Structure==
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[[Category: Galactokinase]]
[[Category: Galactokinase]]
[[Category: Kinase]]
[[Category: Kinase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Tue Jul 29 14:35:25 2008''

Revision as of 11:35, 29 July 2008

Image:2a2d.png

Template:STRUCTURE 2a2d

X-ray structure of human n-acetyl galactosamine kinase complexed with Mn-AMPPNP and n-acetyl glactosamine

Template:ABSTRACT PUBMED 16006554

About this Structure

2A2D is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

The molecular architecture of human N-acetylgalactosamine kinase., Thoden JB, Holden HM, J Biol Chem. 2005 Sep 23;280(38):32784-91. Epub 2005 Jul 8. PMID:16006554

Page seeded by OCA on Tue Jul 29 14:35:25 2008

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