The MPP1 Knockout Raji Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population with targeted disruption of the MPP1 gene in the Raji B lymphocyte cell line. This knockout model is designed for researchers investigating the role of the membrane-associated guanylate kinase (MAGUK) family protein MPP1 in B cell biology. As a polyclonal pool, the population comprises a heterogeneous mixture of MPP1-disrupted cells, enabling studies that reflect the diverse editing outcomes typical of CRISPR/Cas9-mediated gene knockout in a bulk population. The cells maintain the inherent characteristics of the parental Raji line while lacking functional MPP1 protein.
The Raji cell line is a well-established model derived from an Epstein-Barr virus (EBV)-positive Burkitt lymphoma. These B lymphocytes exhibit features of mature B cells and are widely utilized in immunological and oncological studies, particularly those examining B cell receptor (BCR) signaling, apoptosis, and hematopoietic malignancies. The EBV immortalization confers stable proliferation and a transformed phenotype, making Raji cells a convenient and robust host for gene-editing applications. Their B cell origin is ideal for exploring the functions of proteins like MPP1 that are implicated in lymphocyte membrane organization and signal transduction.
MPP1 encodes a membrane-associated guanylate kinase scaffolding protein that organizes multiprotein complexes at the plasma membrane. It interacts with protein 4.1, actin, and glycophorin C, linking the actin cytoskeleton to membrane domains. In lymphocytes, it is implicated in similar scaffolding functions. MPP1 is regulated by Src family kinases and B cell receptor activation, functioning downstream of integrin adhesion signals. It forms complexes with DLG1, CASK, and LIN7, contributing to the control of cell polarity, adhesion, and signal transduction.
In Raji B lymphocytes, MPP1 disruption perturbs membrane-cytoskeleton interactions critical for immunological synapse assembly and BCR signaling. Given the lymphoma origin, this knockout model may elucidate mechanisms of B cell malignancies. MPP1 loss could impair surface receptor anchoring, alter signaling molecule distribution, and compromise integrin-mediated adhesion, affecting lymphocyte activation, proliferation, and survival. This polyclonal population enables observation of MPP1 deficiency phenotypes without clonal bias, providing a relevant model for studying membrane scaffolding and oncogenic signaling in EBV-transformed B cells.
Typical research applications include investigating B cell membrane organization, immunological synapse function, and signal transduction in hematologic malignancies. These polyclonal knockout cells are suitable for Western blotting, flow cytometry, immunofluorescence, cell adhesion assays, and phospho-signaling analysis to probe BCR pathway activity. Co-immunoprecipitation and proteomic analyses can reveal altered protein interactions upon MPP1 removal. For additional information, please contact Ascent Research.
