Phospho-ATR (Ser428) Antibody

About the Target

Phospho-ATR (ataxia-telangiectasia and Rad3-related) (Ser428) is a large serine/threonine protein kinase of the phosphatidylinositol 3-kinase-related kinase (PIKK) family that plays a central role in the DNA damage response (DDR). Structurally, ATR contains a C-terminal kinase domain, HEAT repeats for protein-protein interactions, and regulatory regions, including the Ser428-Pro429 Pin1 recognition motif. Depending on the literature source, ATR may also be discussed as Phospho-ATR (Ser428) and FRP1.

Reported cellular context includes chromosome and nucleus, which can matter when signal is compared across treatments or changing cell states. Following ATR across matched perturbations can help separate abundance effects from shifts in localization, complex assembly, or pathway state.

Research Context

ATR is commonly interpreted in the context of cancer, dna damage / repair, and cell cycle research, and readouts are often stronger when a study separates expression changes from compartment-level redistribution. When reported signal spans chromosome and nucleus, a defined reference condition can make comparisons more interpretable across perturbations, passages, or replicate sets.

Consider these angles when interpreting target-level changes:

• apparent redistribution between chromosome and nucleus across matched conditions
• changes associated with proliferative state, oncogenic signaling, or treatment response
• stress-induced changes after checkpoint activation or genotoxic challenge
• cell-cycle linked differences in abundance, timing, or compartmental enrichment

Variant Considerations

If your project spans exploratory questions, the regular version offers a balanced option for establishing baseline signal behavior for ATR. This can help when protocols evolve over time and the goal is to compare experiments using a stable reference workflow.

Standardize sampling time, control choice, and downstream analysis thresholds so apparent differences in ATR reflect biology rather than handling. When interpreting ATR, it is often useful to decide early whether the main question is overall abundance, compartmental enrichment, or context-dependent redistribution.

For multi-run studies, a shared reference condition can keep ATR trends easier to compare across datasets. That kind of consistency is especially helpful when follow-up work expands to new perturbations, model systems, or longitudinal collections.