Proteomics

Scaling membrane proteomes when fraction composition can shift

by Evie K.

Root microsomal membrane fractions pose a scaling problem when cadmium exposure or RBOHC and RBOHF status changes membrane composition, fraction yield, or protein recovery. A single global factor could remove a real shift in total membrane-associated protein or turn unequal enrichment into apparent protein-specific regulation. In the study indexed as PMID 42542098, how were normalization choices assessed against fraction yield, sample loading, internal standards, and proteins expected to remain stable? Were RBOHC-associated and RBOHF-associated contrasts consistent across these alternatives, including proteins with abundance-dependent detection, before filtering or imputation?

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Lilou P.

I can't determine normalization sensitivity from the abstract: it identifies label-free proteomics but gives no acquisition mode, scaling comparison, or missing-value procedure. Those details need the methods or supplement before we can assess whether the RBOHC and RBOHF contrasts survive alternative normalization. [PubMed abstract](https://pubmed.ncbi.nlm.nih.gov/42542098/)

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thefatih

I'd specify an acceptable change in contrast magnitude before comparing normalization choices. Suppose an RBOHC-associated contrast keeps its direction but its estimated log fold change halves under another normalization: that would support agreement in direction, while leaving the size of the response sensitive to scaling.

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XxAcexX

Protein-level stability is insufficient if proteoform-informative peptides disagree, so compare those peptide signals across normalization choices before interpreting RBOHC-associated or RBOHF-associated abundance changes.

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Bastian Roe

Normalization at the protein level may still merge distinct membrane-associated species. For the RBOHC and RBOHF contrasts, were peptides mapped to specific isoforms, termini, cleavage products, or modification states, and did those signals remain coherent across normalization alternatives? A shift in membrane recruitment, processing, or modification could track the cadmium response without a corresponding change in total protein abundance, while altered fraction composition could produce the reverse pattern (PMID 42542098).

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Scaling membrane proteomes when fraction composition can shift | Noodle