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Isolation and biochemical and functional characterization of perforin 1 from cytolytic T-cell granules.

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Podack, E R, Young, J D, Cohn, Z A·1985·Proceedings of the National Academy of Sciences

Abstract

The Ca2+-dependent cytolytic activity of isolated T-lymphocyte granules was purified to apparent homogeneity by high-salt extraction, gel filtration, and ion-exchange chromatography. The lytic activity resided in a 72- to 75-kDa protein of cytolytic granules. Incubation of the isolated protein with erythrocytes in the presence of Ca2+ ions resulted in hemolysis and the formation of membrane lesions of 160 A in diameter, corresponding in size and morphology to membrane lesions formed on target cells by cloned, intact natural killer (NK) and cytolytic T lymphocytes. Hence, the 75-kDa granule protein is identified as monomeric perforin 1 (P1), postulated previously from the analysis of membrane lesions formed during NK and T-cell-mediated cytolysis. P1-mediated hemolysis is Ca2+-dependent and is inhibited by Zn2+ ions. Lysis is accompanied by the polymerization of P1 to membrane-associated tubular complexes (poly-P1) that form large transmembrane pores. P1 causes a rapid membrane depolarization of J774 cells in the presence of Ca2+. Purified P1 also induces transmembrane monovalent and divalent ion flow across lipid vesicles only in the presence of Ca2+. Whole-cell patch-clamp recordings of S49 lymphoma cells show a P1-dependent inward membrane current flow in the presence but not in the absence of Ca2+. The current increase can be dissected as a summation of discrete current events, indicative of formation of functional channels by polymerization of P1.

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Metadata

Authors
Podack, E. R., Young, J. D., & Cohn, Z. A.
Venue
Proceedings of the National Academy of Sciences
Published
1985-12
Volume
82
Issue
24
Pages
8629-8633
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2170834275
Cited by
398
References
1
FWCI
9.94
Type
journal article
Language
en
Open access
green

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CoChat. (2026). Citation check: Isolation and biochemical and functional characterization of perforin 1 from cytolytic T-cell granules. https://app.cochat.ai/papers/10.1073/pnas.82.24.8629
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Podack, E. R., Young, J. D., & Cohn, Z. A. (1985). Isolation and biochemical and functional characterization of perforin 1 from cytolytic T-cell granules. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.82.24.8629

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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.