1QCA image
Deposition Date 1995-08-03
Release Date 1995-10-15
Last Version Date 2024-02-14
Entry Detail
PDB ID:
1QCA
Title:
QUADRUPLE MUTANT Q92C, N146F, Y168F, I172V TYPE III CAT COMPLEXED WITH FUSIDIC ACID. CRYSTALS GROWN AT PH 6.3. X-RAY DATA COLLECTED AT ROOM TEMPERATURE
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Observed:
0.17
Space Group:
H 3 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:TYPE III CHLORAMPHENICOL ACETYLTRANSFERASE
Gene (Uniprot):cat3
Mutations:Q92C, N146F, Y168F, I172V
Chain IDs:A
Chain Length:213
Number of Molecules:1
Biological Source:Shigella flexneri
Primary Citation
Steroid recognition by chloramphenicol acetyltransferase: engineering and structural analysis of a high affinity fusidic acid binding site.
J.Mol.Biol. 254 993 1005 (1995)
PMID: 7500366 DOI: 10.1006/jmbi.1995.0671

Abstact

The antibiotic fusidic acid and certain closely related steroidal compounds are potent competitive inhibitors of the type I variant of chloramphenicol acetyltransferase (CATI). In the absence of crystallographic data for CATI, the structural determinants of steroid binding were identified by (1) construction in vitro of genes encoding chimaeric enzymes containing segments of CATI and the related type III variant (CATIII) and (2) site-directed mutagenesis of the gene encoding CATIII, followed by kinetic characterisation of the substituted variants. Replacement of four residues of CATIII (Gln92, Asn146, Tyr168 and Ile172) by their equivalents from CATI yields an enzyme variant that is susceptible to competitive inhibition by fusidate with respect to chloramphenicol (Ki = 5.4 microM). The structure of the complex of fusidate and the Q92C/N146F/Y168F/I172V variant, determined at 2.2 A resolution by X-ray crystallography, reveals the inhibitor bound deep within the chloramphenicol binding site and in close proximity to the side-chain of His195, an essential catalytic residue. The aromatic side-chain of Phe146 provides a critical hydrophobic surface which interacts with non-polar substituents of the steroid. The remaining three substitutions act in concert both to maintain the appropriate orientation of Phe 146 and via additional interactions with the bound inhibitor. The substitution of Gln92 by Cys eliminates a critical hydrogen bond interaction which constrains a surface loop (residues 137 to 142) of wild-type CATIII which must move in order for fusidate to bind to the enzyme. Only two hydrogen bonds are observed in the CAT-fusidate complex, involving the 3-alpha-hydroxyl of the A-ring and both hydroxyl of Tyr25 and NE2 of His195, both of which are also involved in hydrogen bonds with substrate in the CATIII-chloramphenicol complex. In the acetyl transfer reaction catalysed by CAT, NE2, of His195 serves as a general base in the abstraction of a proton from the 3-hydroxyl of chloramphenicol as the first chemical step in catalysis. The structure of the CAT-inhibitor complex suggests that deprotonation of the 3-alpha-hydroxyl of bound fusidate by this mechanism could produce an oxyanion nucleophile analogous to that seen with chloramphenicol, but one which is incorrectly positioned to attack the thioester carbonyl of acetyl-CoA, accounting for the observed failure of CAT to acetylate fusidate.

Legend

Protein

Chemical

Disease

Primary Citation of related structures