ISDA

Entry Detail

PDB ID:

4AG7

Keywords:

TRANSFERASE

Title:

C. elegans glucosamine-6-phosphate N-acetyltransferase (GNA1): coenzyme A adduct

Biological Source:

Source Organism:

CAENORHABDITIS ELEGANS

Host Organism:

ESCHERICHIA COLI

PDB Version:

Deposition Date:

2012-01-24

Release Date:

2012-07-25

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.55 Å

R-Value Free:

0.21

R-Value Work:

0.17

R-Value Observed:

0.17

Space Group:

P 61

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:GLUCOSAMINE-6-PHOSPHATE N-ACETYLTRANSFERASE
Chain IDs:A, B
Chain Length:165
Number of Molecules:2
Biological Source:CAENORHABDITIS ELEGANS

UniProt ID:Q17427 Pfam ID:PF00583 EC:2.3.1.4

Ligand Molecules

COA

Primary Citation

Structural and Biochemical Characterization of a Trapped Coenzyme a Adduct of Caenorhabditis Elegans Glucosamine-6-Phosphate N-Acetyltransferase 1.

Dorfmueller, H.C, Fang, W, Rao, F.V, Blair, D.E, Attrill, H, Van Aalten, D.M.F.Show

Acta Crystallogr.,Sect.D 68 1019 ? (2012)

PMID: 22868768 DOI: 10.1107/S0907444912019592

Abstact

Glucosamine-6-phosphate N-acetyltransferase 1 (GNA1) produces GlcNAc-6-phosphate from GlcN-6-phosphate and acetyl coenzyme A. Early mercury-labelling experiments implicated a conserved cysteine in the reaction mechanism, whereas recent structural data appear to support a mechanism in which this cysteine plays no role. Here, two crystal structures of Caenorhabditis elegans GNA1 are reported, revealing an unusual covalent complex between this cysteine and the coenzyme A product. Mass-spectrometric and reduction studies showed that this inactive covalent complex can be reactivated through reduction, yet mutagenesis of the cysteine supports a previously reported bi-bi mechanism. The data unify the apparently contradictory earlier reports on the role of a cysteine in the GNA1 active site.

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