Protocol to quantify polyphosphate in human cell lines using a tagged PPBD peptide

STAR Protoc. 2022 May 1;3(2):101363. doi: 10.1016/j.xpro.2022.101363. eCollection 2022 Jun 17.

Abstract

Polyphosphate (polyP) is an evolutionarily conserved polymer of phosphates that is difficult to study in human cells because of its low concentration and high lability. First, we described how to express and purify Xpress-tagged PPBD (Ppx1 PolyP Binding Domain). We describe the detection and quantification of nuclear polyP in HEK293T cells using Xpress-PPBD, Xpress antibody, and Alexa-conjugated secondary antibodies. We have also used this protocol in SH-SY5Y HeLa and HEK293 cells. For complete details on the use and execution of this protocol, please refer to Samper-Martín et al. (2021).

Keywords: Antibody; Cell Biology; Microscopy; Protein Biochemistry; Protein expression and purification.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Nucleus* / metabolism
  • HEK293 Cells
  • HeLa Cells
  • Humans
  • Peptides / chemistry
  • Peptides / metabolism*
  • Polyphosphates* / chemistry
  • Polyphosphates* / metabolism

Substances

  • Peptides
  • Polyphosphates