PDBsum entry: 2fyv

Hydrolase

PDB id: 2fyv

Contents

Protein chain

1014 a.a. *

Ligands

NAG

PO4

W72

MPD

Metals

_ZN

Waters ×1048

* Residue conservation analysis

PDB id:

2fyv

Name:

Hydrolase

Title:

Golgi alpha-mannosidase ii complex with an amino-salacinol c analog

Structure:

Putative golgi alpha-mannosidase ii. Chain: a. Fragment: catalytic domain. Engineered: yes

Source:

Drosophila melanogaster. Fruit fly. Organism_taxid: 7227. Expressed in: drosophila melanogaster. Expression_system_taxid: 7227.

Resolution:

1.90Å R-factor: 0.162 R-free: 0.212

Authors:

D.A Kuntz,T.Hamlet,D.R.Rose

Key ref:

W.Chen et al. (2006). Synthesis, enzymatic activity, and X-ray crystallography of an unusual class of amino acids. Bioorg Med Chem, 14, 8332-8340. PubMed id: 17010621 DOI: 10.1016/j.bmc.2006.09.004

Date:

08-Feb-06 Release date: 26-Dec-06

Protein chain

Q24451  (MAN2_DROME) -  Alpha-mannosidase 2

Seq: 1108 a.a.

Struc: 1014 a.a.*

* PDB and UniProt seqs differ at 1 residue position (black cross)

Enzyme reactions

• Enzyme class: E.C.3.2.1.114 - Mannosyl-oligosaccharide 1,3-1,6-alpha-mannosidase.
• Pathway: Mannosyl-glycoprotein N-acetylglucosaminyltransferases
• Reaction: Hydrolysis of the terminal 1,3- and 1,6-linked alpha-D-mannose residues in the mannosyl-oligosaccharide Man(5)(GlcNAc)(3).

 Gene Ontology (GO) functional annotation 

• Cellular component: membrane (6 terms)
• Biological process: metabolic process (3 terms)
• Biochemical function: catalytic activity (11 terms)

DOI no: 10.1016/j.bmc.2006.09.004

Bioorg Med Chem 14:8332-8340 (2006)

PubMed id: 17010621

Synthesis, enzymatic activity, and X-ray crystallography of an unusual class of amino acids.

W.Chen, D.A.Kuntz, T.Hamlet, L.Sim, D.R.Rose, B.Mario Pinto.

ABSTRACT

The synthesis of two novel amino acids, nitrogen analogues of the naturally occurring glycosidase inhibitor, salacinol, containing a carboxylate inner salt are described, along with the crystal structure of one of these analogues in the active site of Drosophila melanogaster Golgi mannosidase II (dGMII). Salacinol, a naturally occurring sulfonium ion, is one of the active principals in the aqueous extracts of Salacia reticulata that are traditionally used in Sri Lanka and India for the treatment of diabetes. The synthetic strategy relies on the nucleophilic attack of 2,3,5-tri-O-benzyl-1,4-dideoxy-1,4-imino l- or d-arabinitol at the least hindered carbon of 5,6-anhydro-2,3-di-O-benzyl-l-ascorbic acid to yield coupled adducts. Deprotection, stereoselective catalytic reduction, and hydrolysis of the coupled products give the target compounds. The compound derived from d-arabinitol inhibits dGMII, one of the critical enzymes in the glycoprotein processing pathway, with an IC(50) of 0.3mM. Inhibition of GMII has been identified as a target for control of metastatic cancer. An X-ray crystal structure of the complex of this compound with dGMII provides insight into the requirements for an effective inhibitor. The same compound inhibits recombinant human maltase glucoamylase, one of the key intestinal enzymes involved in the breakdown of glucose oligosaccharides in the small intestine, with a K(i) value of 21muM.