Our Abpromise guarantee covers the use of ab74645 in the following tested applications.

The application notes include recommended starting dilutions; optimal dilutions/concentrations should be determined by the end user.

  • Form

  • Additional notes

    - First try to dissolve a small amount of peptide in either water or buffer. The more charged residues on a peptide, the more soluble it is in aqueous solutions.
    - If the peptide doesn’t dissolve try an organic solvent e.g. DMSO, then dilute using water or buffer.
    - Consider that any solvent used must be compatible with your assay. If a peptide does not dissolve and you need to recover it, lyophilise to remove the solvent.
    - Gentle warming and sonication can effectively aid peptide solubilisation. If the solution is cloudy or has gelled the peptide may be in suspension rather than solubilised.
    - Peptides containing cysteine are easily oxidised, so should be prepared in solution just prior to use.

  • Concentration information loading...

Preparation and Storage

  • Stability and Storage

    Shipped at 4°C. Upon delivery aliquot and store at -20°C or -80°C. Avoid repeated freeze / thaw cycles.

    Information available upon request.

General Info

  • Alternative names

    • BP 8
    • CBF-A
    • CCAAT binding transcription factor I subunit A
    • CCAAT-binding transcription factor I subunit A
    • CSDA2
    • CSDB
    • DBPB
    • DNA binding protein B
    • DNA-binding protein B
    • EFI-A
    • Enhancer factor I subunit A
    • MDR NF1
    • MGC104858
    • MGC110976
    • MGC117250
    • NSEP 1
    • NSEP1
    • Nuclease sensitive element binding protein 1
    • Nuclease-sensitive element-binding protein 1
    • p50
    • Q15905
    • Y-box binding protein 1
    • Y-box transcription factor
    • Y-box-binding protein 1
    • YB 1
    • YB-1
    • YBX 1
    • ybx1
    see all
  • Function

    Mediates pre-mRNA alternative splicing regulation. Binds to splice sites in pre-mRNA and regulates splice site selection. Binds and stabilizes cytoplasmic mRNA. Contributes to the regulation of translation by modulating the interaction between the mRNA and eukaryotic initiation factors (By similarity). Regulates the transcription of numerous genes. Its transcriptional activity on the multidrug resistance gene MDR1 is enhanced in presence of the APEX1 acetylated form at 'Lys-6' and 'Lys-7'. Binds to promoters that contain a Y-box (5'-CTGATTGGCCAA-3'), such as MDR1 and HLA class II genes. Promotes separation of DNA strands that contain mismatches or are modified by cisplatin. Has endonucleolytic activity and can introduce nicks or breaks into double-stranded DNA (in vitro). May play a role in DNA repair. Component of the CRD-mediated complex that promotes MYC mRNA stability.
    The secreted form acts as an extracellular mitogen and stimulates cell migration and proliferation.
  • Sequence similarities

    Contains 1 CSD (cold-shock) domain.
  • Post-translational

    Ubiquitinated by RBBP6; leading to a decrease of YBX1 transcativational ability.
    In the absence of phosphorylation the protein is retained in the cytoplasm.
    Cleaved by a 20S proteasomal protease in response to agents that damage DNA. Cleavage takes place in the absence of ubiquitination and ATP. The resulting N-terminal fragment accumulates in the nucleus.
  • Cellular localization

    Cytoplasm. Nucleus. Cytoplasmic granule. Secreted. Localized in cytoplasmic mRNP granules containing untranslated mRNAs. Shuttles between nucleus and cytoplasm. Predominantly cytoplasmic in proliferating cells. Cytotoxic stress and DNA damage enhance translocation to the nucleus. Localized with DDX1, MBNL1 and TIAL1 in stress granules upon stress. Secreted by mesangial and monocytic cells after inflammatory challenges. Translocates from the cytoplasm to the nucleus after and colocalizes with APEX1 in nuclear speckles after genotoxic stress.
  • Information by UniProt


ab74645 has not yet been referenced specifically in any publications.

Customer reviews and Q&As


We have not tested whether this peptide is stable at pH 4.5 so we cannot guarantee that it will be.
The buffer we supply it in is at pH 6.75 so it should be stable at pH 6.5.

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