Isolation of the lateral border recycling compartment using a diaminobenzidine-induced density shift

David P. Sullivan, Claas Rüffer, William A. Muller*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


The migration of leukocytes across the endothelium and into tissue is critical to mounting an inflammatory response. The lateral border recycling compartment (LBRC), a complex vesicular-tubule invagination of the plasma membrane found at endothelial cell borders, plays an important role in this process. Although a few proteins have been shown to be present in the LBRC, no unique marker is known. Here, we detail methods that can be used to characterize a subcellular compartment that lacks an identifying marker. Initial characterization of the LBRC was performed using standard subcellular fractionation with sucrose gradients and took advantage of the observation that the compartment migrated at a lower density than other membrane compartments. To isolate larger quantities of the compartment, we modified a classic technique known as a diaminobenzidine (DAB)-induced density shift. The DAB-induced density shift allowed for specific isolation of membranes labeled with horseradish peroxidase-conjugated antibody. Because the LBRC could be differentially labeled at 4°C and 37°C, we were able to identify proteins that are enriched in the compartment, despite lacking a unique marker. These methods serve as a model to others studying poorly characterized compartments and organelles and are applicable to a wide variety of biological systems.

Original languageEnglish (US)
Pages (from-to)1016-1029
Number of pages14
Issue number9
StatePublished - Sep 2014


  • DAB density shift
  • Endothelial cell
  • Fractionation
  • IQGAP1
  • LBRC

ASJC Scopus subject areas

  • Genetics
  • Molecular Biology
  • Structural Biology
  • Biochemistry
  • Cell Biology


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