ISDA

Deposition Date 1999-12-10

Release Date 2000-12-07

Last Version Date 2025-04-09

Entry Detail

PDB ID:

1DWQ

Keywords:

HYDROXYNITRILE LYASE

Title:

Crystal Structure of Hydroxynitrile Lyase from Manihot esculenta in Complex with Substrates Acetone and Chloroacetone:Implications for the Mechanism of Cyanogenesis

Biological Source:

Source Organism:

MANIHOT ESCULENTA (Taxon ID: 3983)

Host Organism:

ESCHERICHIA COLI

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.20 Å

R-Value Free:

0.24

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

P 41 21 2

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:HYDROXYNITRILE LYASE
Gene (Uniprot):HNL
Chain IDs:A, B
Chain Length:262
Number of Molecules:2
Biological Source:MANIHOT ESCULENTA

UniProt ID:P52705 Pfam ID:PF00561 EC:4.1.2.47

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
CSA	A	CYS	S-ACETONYLCYSTEINE

Ligand Molecules

ATO

Primary Citation

Structure of Hydroxynitrile Lyase from Manihot Esculenta in Complex with Substrates Acetone and Chloroacetone: Implications for the Mechanism of Cyanogenesis

Lauble, H, Forster, S, Miehlich, B, Wajant, H, Effenberger, F.Show

Acta Crystallogr.,Sect.D 57 194 ? (2001)

PMID: 11173464 DOI: 10.1107/S0907444900015766

Abstact

The crystal structures of hydroxynitrile lyase from Manihot esculenta (MeHNL) complexed with the native substrate acetone and substrate analogue chloroacetone have been determined and refined at 2.2 A resolution. The substrates are positioned in the active site by hydrogen-bond interactions of the carbonyl O atom with Thr11 OG, Ser80 OG and, to a lesser extent, Cys81 SG. These studies support a mechanism for cyanogenesis as well as for the stereospecific MeHNL-catalyzed formation of (S)-cyanohydrins, which closely resembles the base-catalyzed chemical reaction of HCN with carbonyl compounds.

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Primary Citation of related structures