Practical Fragments

This blog is meant to allow Fragment-based Drug Design Practitioners to get together and discuss NON-CONFIDENTIAL issues regarding fragments.

13 April 2026

Fragments vs the E3 ligase KLHL12

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Last week we highlighted work out of Steve Fesik’s lab at Vanderbilt University about PLPro. This week we’ll highlight another paper just p...
06 April 2026

From noncovalent fragment to (non)covalent leads against PLPro

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The most successful drug against COVID-19, nirmatrelvir, targets the main protease of SARS-CoV-2. As we discussed just last year, this prot...
01 April 2026

NICELE: everyone gets an A+!

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Since the invention of ligand efficiency ( LE ) more than two decades ago, scholars have been debating its strengths and weaknesses. And alt...
3 comments:
23 March 2026

Ligand reactivity efficiency (LRE)

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As covalent drug discovery continues to rise, the demand for metrics to help guide lead optimization is increasing. Last year we discussed c...
5 comments:
16 March 2026

Malicious metals muddy fragment-to-lead optimization

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Despite the effectiveness of vaccines against SARS-CoV-2, COVID-19 continues to plague us. The handful of approved small molecule drugs targ...
09 March 2026

Selectivity in cells may vary

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Last year we celebrated the ten-year anniversary of the Chemical Probes Portal. One of the key requirements for a chemical probe is selecti...
5 comments:
02 March 2026

Best practices for applying HDX-MS to FBLD

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Among the many biophysical techniques presented at the recent Novalix meeting , hydrogen/deuterium exchange mass spectrometry ( HDX-MS ) was...
23 February 2026

Twelfth Novalix Biophysics in Drug Discovery Conference

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Last week the Twelfth Novalix Biophysics in Drug Discovery Conference was held for the first time in La Jolla, California. It’s been severa...
16 February 2026

3D fragments vs the histamine H1 receptor

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Last month we highlighted a paper from Iwan de Esch and colleagues at Vrije Universiteit Amsterdam about assessing molecular shapeliness....
09 February 2026

Multivalent fragments in the clinic: Muvalaplin

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It’s been a couple years since Practical Fragments last updated our “fragments in the clinic” list . Before doing so it makes sense to high...
02 February 2026

xSAR: Crystallographic SAR from crude reactions

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Last year we highlighted an example of crystallographic screening of crude reaction mixtures to find inhibitors against the oncology target...
26 January 2026

Fragment merging – and flipping – on the leucine zipper of MITF

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Transcription factors can be difficult drug targets, particularly those whose primary structure is a “leucine zipper” in which two α -helice...
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