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and plasma membrane. Liver is an ER-rich organ and has been used for isolation of ER for decades.

Traditional methods for isolating ER are based on density-gradient ultracentrifugation. The protocol requires a

large amount of starting material and the methods are tedious and time-consuming and contain significant

cross-contamination. Currently, all commercial kits for ER isolation are basedon methods developed in the

1970s. Unlike any other ER isolation kit on the market, this kit employs a patented spin-column-based

technology that is simple and rapid and requires only a small amount of tissue. This kit can differentially

precipitate native ER (mainly rough ER) from frozen liver tissues without using a Dounce homogenizer or

ultracentrifugation. The whole protocol can be done in about 2 hours.

Isolation of ER from frozen mouse tissue.  A. Ponceau S stained blot.  B. Wester blot of different organelle

markers. PM- Na/K (ATPase, Novus, NB300146S) ER- hCalreticulin (R&D System, MAB38981) GAPDH

(Biolegend, 631401).  1. Total liver lysate, 2 and 3. Isolated ER fraction in duplicate.