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Evaluating transition state structures of vanadium-phosphatase protein complexes using shape analysis.

Irma Sánchez-Lombardo¹, Santiago Alvarez², Craig C McLauchlan³

¹Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.

Journal of Inorganic Biochemistry

|May 9, 2015

Summary

Vanadium in phosphatases adopts a trigonal bipyramidal geometry, crucial for understanding phosphate hydrolysis mechanisms. Umbrella distortions in this geometry represent key transition states for phosphoryl group transfer.

Keywords:

Continuous shape measures Phosphoryl group transfer Transition state analog Trigonal bipyramid Vanadium phosphatase complexes

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Area of Science:

Coordination chemistry
Biochemistry
Structural biology

Background:

Vanadium coordination complexes are studied for their role in enzyme active sites, particularly phosphatases.
Trigonal bipyramidal (TBPY-5) geometry is implicated in the mechanism of phosphate ester hydrolysis.
Previous studies suggest vanadium's trigonal bipyramidal geometry is key, aligning with transition state models.

Purpose of the Study:

To investigate the structural dynamics of five-coordinate vanadium-phosphatase complexes.
To analyze the mechanistic transformations between tetrahedral and trigonal bipyramidal geometries.
To identify transition state structures relevant to phosphoryl group transfer reactions.

Main Methods:

Continuous shape measures (CShM) analysis was employed.
X-ray crystallography data of vanadium-phosphatase complexes were analyzed.
Structural space of vanadium coordination geometries was explored, focusing on protein tyrosine phosphatase 1B (PTP1B).

Main Results:

Shape analysis confirmed trigonal bipyramidal (TBPY-5) geometry for vanadium in phosphatases.
No evidence of square pyramidal geometries was found in vanadium-protein complexes.
Umbrella distortions were identified as critical on the reaction pathway between tetrahedral and TBPY-5 states.

Conclusions:

Umbrella distortions of the trigonal bipyramid represent relevant transition state structures for phosphoryl transfer in phosphatases.
These findings may explain vanadium's inhibitory role in enzymes with specific transition state geometries.
The study provides insights into the mechanism of organic phosphate cleavage by phosphatases.