1V9Q: Crystal Structure Of An Artificial Metalloprotein:mn(iii)(3,3'-me2- Salophen)/apo-a71g Myoglobin

Citation:
Abstract
New methods for the synthesis of artificial metalloenzymes are important for the construction of novel biocatalysts and biomaterials. Recently, we reported new methodology for the synthesis of artificial metalloenzymes by reconstituting apo-myoglobin with metal complexes (Ohashi, M. et al., Angew Chem., Int. Ed. 2003, 42, 1005-1008). However, it has been difficult to improve their reactivity, since their crystal structures were not available. In this article, we report the crystal structures of M(III)(Schiff base).apo-A71GMbs (M = Cr and Mn). The structures suggest that the position of the metal complex in apo-Mb is regulated by (i) noncovalent interaction between the ligand and surrounding peptides and (ii) the ligation of the metal ion to proximal histidine (His93). In addition, it is proposed that specific interactions of Ile107 with 3- and 3'-substituent groups on the salen ligand control the location of the Schiff base ligand in the active site. On the basis of these results, we have successfully controlled the enantioselectivity in the sulfoxidation of thioanisole by changing the size of substituents at the 3 and 3' positions. This is the first example of an enantioselective enzymatic reaction regulated by the design of metal complex in the protein active site.
PDB ID: 1V9QDownload
MMDB ID: 33318
PDB Deposition Date: 2004/1/29
Updated in MMDB: 2017/10
Experimental Method:
x-ray diffraction
Resolution: 1.45  Å
Source Organism:
Similar Structures:
Biological Unit for 1V9Q: monomeric; determined by author
Molecular Components in 1V9Q
Label Count Molecule
Protein (1 molecule)
1
Myoglobin
Molecule annotation
Chemicals (8 molecules)
1
6
2
1
3
1
* Click molecule labels to explore molecular sequence information.

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