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Multipartite signaling proteins and uses thereof

  • US 10,428,142 B2
  • Filed: 01/28/2015
  • Issued: 10/01/2019
  • Est. Priority Date: 07/29/2013
  • Status: Active Grant
First Claim
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1. An isolated non-natural cell comprising:

  • (a) a first nucleic acid molecule encoding a first fusion protein comprising a first multimerization domain comprising an FRB T2098L polypeptide, a CD8a transmembrane domain, a costimulatory domain of 4-1BB, and an actuator domain of CD3, wherein the first multimerization domain localizes extracellularly when the first fusion protein is expressed; and

    (b) a second nucleic acid molecule encoding a second fusion protein comprising a binding domain comprising a single chain antibody variable region (scFv) specific for CD19 or B cell maturation antigen (BCMA), a second multimerization domain comprising an FKBP12 polypeptide, and a CD4, a CD154 or a CD71 transmembrane domain, wherein the second multimerization domain localizes extracellularly when the first fusion protein is expressed;

    wherein the first fusion protein and the second fusion protein are each expressed as separate fusion proteins and form a polypeptide complex on the non-natural cell surface in the presence of a bridging factor, rapalog AP21967; and

    wherein the bridging factor is associated with and disposed between the first and second multimerization domains.

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