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Updated: Jan 23, 2026

A Protocol for Computer-Based Protein Structure and Function Prediction

A Protocol for Computer-Based Protein Structure and Function Prediction

Published on: November 3, 2011

How mithramycin stereochemistry dictates its structure and DNA binding function.

Caixia Hou¹, Jürgen Rohr¹, Sean Parkin²

¹University of Kentucky , Department of Pharmaceutical Sciences , College of Pharmacy , Lexington , KY 40536-0596 , USA . Email: oleg.tsodikov@uky.edu ;

|June 14, 2019

Summary

This summary is machine-generated.

Mithramycin (MTM), an anticancer drug, binds DNA as a dimer. Boric acid inactivates MTM by forming a macrocyclic species, offering insights for new cancer therapeutics.

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Area of Science:

Natural Product Chemistry
Structural Biology
Medicinal Chemistry

Background:

Mithramycin (MTM) is a natural product with potent antineoplastic properties.
MTM functions by binding to the minor groove of double-stranded DNA as a metal ion-coordinated dimer.
Understanding MTM's structural and biochemical interactions is crucial for developing novel anticancer agents.

Purpose of the Study:

To elucidate the structural basis of MTM's DNA binding and dimerization.
To investigate the mechanism of MTM inactivation by boric acid.
To inform the design of improved MTM analogues for cancer therapy.

Main Methods:

X-ray crystallography was used to determine the structure of an MTM analogue (MTM SA-Phe) in its active dimeric form.
Crystallographic and biochemical methods were employed to study the interaction of MTM with boric acid.
Structural analysis focused on the stereochemical features dictating dimer formation and DNA binding.

Main Results:

The crystal structure revealed how MTM's stereochemistry dictates the helicity of the dimeric scaffold for binding to right-handed DNA.
MTM, unlike MTM SA-Phe, is inactivated by boric acid, forming a large macrocyclic species via intermolecular boron-sugar bonds.
These findings provide structural insights into MTM's mechanism of action and inactivation.

Conclusions:

The stereochemical features of MTM are critical for its DNA binding and dimeric structure.
Boric acid-mediated inactivation of MTM offers a new perspective on its chemical reactivity.
Structural and biochemical data can guide the rational design of mithramycin-based anticancer drugs.