5UGI

Crystal Structure of Ketosteroid Isomerase D38GF54A mutant from Pseudomonas Testosteroni (tKSI) bound to Equilenin

Summary for 5UGI

• Entry DOI: 10.2210/pdb5ugi/pdb
• Descriptor: Steroid Delta-isomerase, EQUILENIN (3 entities in total)
• Functional Keywords: enzyme, isomerase
• Biological source: Comamonas testosteroni
• Total number of polymer chains: 1
• Total formula weight: 13544.30

Authors

Yabukarski, F.,Lamba, V.,Herschlag, D. (deposition date: 2017-01-08, release date: 2017-11-15, Last modification date: 2023-10-04)

Primary citation

Lamba, V.,Yabukarski, F.,Herschlag, D.
An Activator-Blocker Pair Provides a Controllable On-Off Switch for a Ketosteroid Isomerase Active Site Mutant.
J. Am. Chem. Soc., 139:11089-11095, 2017

PubMed Abstract: Control of enzyme activity is fundamental to biology and represents a long-term goal in bioengineering and precision therapeutics. While several powerful molecular strategies have been developed, limitations remain in their generalizability and dynamic range. We demonstrate a control mechanism via separate small molecules that turn on the enzyme (activator) and turn off the activation (blocker). We show that a pocket created near the active site base of the enzyme ketosteriod isomerase (KSI) allows efficient and saturable base rescue when the enzyme's natural general base is removed. Binding a small molecule with similar properties but lacking general-base capability in this pocket shuts off rescue. The ability of small molecules to directly participate in and directly block catalysis may afford a broad controllable dynamic range. This approach may be amenable to numerous enzymes and to engineering and screening approaches to identify activators and blockers with strong, specific binding for engineering and therapeutic applications.

PubMed: 28719738
DOI: 10.1021/jacs.7b03547

Experimental method

X-RAY DIFFRACTION (1.8 Å)