Design a Western Blot for PRMT7

Band shift · Use the separately labelled calculated mass and catalog-observed evidence above. A sequence annotation does not establish an observed migration shift. Verify target identity with orthogonal controls.

Isoforms · Yes. Four isoforms are listed. Relative to canonical isoform 1, isoform 3 lacks residues 45–94, isoform 2 lacks 95–168 and 399–472, and isoform 4 has a replacement at 526–567 and lacks 568–692. These sequence differences could affect band position, but the features do not establish which isoforms are present in a sample.

Define which band or bands you will measure and keep that choice consistent across samples. Four isoforms have distinct sequences, so an antibody may detect them differently depending on its epitope. A band near 78 kDa alone does not establish that every isoform is included.

PTM · The linked UniProt record describes protein features. A modification annotation alone does not demonstrate a visible shift; retain any condition or experimental qualifier attached to it.

Induction · No general induction response is established by this guide. A pathway or gene-set association is not evidence of induction in a particular specimen. Verify the relevant treatment and control in a target-specific experiment.

Transfer · Standard workflow guidance: verify transfer efficiency for the intended target size before interpreting a weak signal. Use total-protein assessment and optimize transfer for the membrane, gel and apparatus; the labelled catalog values take precedence.

Blocking · Standard workflow guidance: follow the A05485-2 datasheet where specified. Otherwise compare 5% milk or 5% BSA in TBST; for a phospho-specific assay start with BSA. Optimize background and specific signal with matched controls.

Quantitation · Standard workflow guidance: quantify only a validated target band within the linear exposure range. Use consistent sample preparation and loading, retain biological replicates, and avoid interpreting saturation or loading differences as regulation.

Interpretation · The observed band near 78 kDa is close to the predicted 78.5 kDa for canonical PRMT7. The listed methylation site alone does not establish a visible shift.

Check whether its epitope falls within an isoform-specific change: residues 45–94 are missing in isoform 3; 95–168 and 399–472 in isoform 2; and 526–567 are replaced and 568–692 missing in isoform 4. These are UniProt canonical-sequence coordinates. An antibody against an absent region may miss that isoform.

UniProt lists omega-N-methylarginine at Arg32 in canonical-sequence numbering. If an antibody or paper uses another numbering convention, align the sequences before comparing sites. This feature establishes a modification site, but does not demonstrate a visible band shift or explain an observed-versus-calculated mass difference.

First compare their positions with the canonical band near 78 kDa and consider the listed isoform deletions and replacement. Check whether the antibody epitope is retained in each isoform. PRMT7 can form dimers, but the supplied features do not establish that a dimer or the Arg32 modification produces any particular extra band.

Yes. PRMT7 is reported in both cytosol and nucleus. When comparing fractions, account for both locations and apply the same fraction and band selection across samples. A signal in either fraction is consistent with the supplied localization features.