Compound Library Screening Service

Once a compound collection is in hand, the practical question becomes which molecules actually do something. Compound-library screening answers that experimentally, using assays and biophysical methods to detect activity or binding across many compounds at once. It is the empirical counterpart to computational screening: where virtual screening narrows a library in silico, experimental screening confirms which compounds genuinely interact with the target.

Different questions call for different screening formats. A functional or biochemical assay measures whether a compound changes the target's activity, which is often the most directly relevant signal. Structural and biophysical methods instead detect the physical event of binding — crystal soaking reveals where and how a ligand sits in the binding site, while label-free resonance-based analysis measures affinity and binding kinetics in solution. Used together, they separate true binders from assay artifacts and give each compound's behavior a mechanistic explanation.

Running these campaigns in house requires assay infrastructure, crystallization or biophysics instrumentation, and the throughput to test libraries systematically. Many teams outsource to keep access to several screening formats without maintaining every platform, and to obtain results that are consistent across an entire library rather than dependent on one instrument's condition on the day.

What the Service Covers

• Classical high-throughput screening (HTS) – testing a compound collection against a defined biochemical or functional readout in a microplate format, then confirming the compounds that show a reproducible effect.
• Crystal soaking – exposing target crystals to candidate compounds and detecting those that bind from the resulting electron density, which shows the binding site and pose directly at atomic detail.
• Label-free binding analysis by surface plasmon resonance – measuring real-time, quantitative binding of compounds to the target in solution, including affinity and association and dissociation kinetics, without labelling the interactants.

Screening Approaches

The three formats answer different questions and are most informative when combined: an activity screen tells you a compound matters, a structure tells you how, and a binding measurement tells you how tightly and how fast.

Workflow

• Define the question – decide what a hit must demonstrate and choose the screening format or combination that will show it.
• Prepare the library and target – format the compound collection and prepare the assay, crystals, or sensor surface as required.
• Run the primary screen – test the library under controlled conditions and flag the compounds that respond.
• Confirm and characterize – re-test promising compounds, remove false positives, and characterize confirmed hits by the complementary format where useful.
• Deliver – provide a ranked hit list with the supporting data, and structural or binding detail for the compounds that were followed up.

Applications

• Hit identification – find the compounds in a collection that interact with a target of interest.
• Hit confirmation – verify screen positives and eliminate compounds whose effect is an assay artifact.
• Binding characterization – quantify affinity and kinetics for lead selection and for ranking compounds within a series.
• Mode-of-action studies – establish where and how a compound binds in order to explain its activity.
• Library evaluation – assess the usefulness of a purchased or in-house collection against a specific target.

Why Work With Us

Screening results are only meaningful if the positives are real and the negatives are not missed. We run campaigns under consistent conditions, re-test anything that looks promising, and use a complementary method to confirm binding before calling a compound a hit — so the list you receive is one you can act on. Access to activity, structural, and biophysical formats in one place means hits can be confirmed and characterized without moving the project between providers.