Calstorin, a new Ca2+ binding protein of the microsome lumen which is abundant in the rat brain

G. Racchetti, P. Papazafiri, P. Volpe, J. Meldolesi

Research output: Contribution to journalArticlepeer-review

Abstract

A new Ca2+ binding protein (apparent Mr: 54 KDa; pI: 4.37; Stains All positive) which, based on N terminal sequence and immunological criteria, appears different from calsequestrin, calreticulin and the chaperonins, has been identified in the rat brain and recovered primarily in the microsome fraction. Carbonate extraction and trypsin digestion experiments suggest the protein to be located within the microsome lumen. Its expression levels are considerable especially in the cerebellum (65% with respect to calreticulin). 45Ca binding experiments on 2D blots suggest the protein to be of high capacity (higher than calreticulin) and low affinity (apparent Kd: 3 mM). These properties are typical of the proteins participating in the storage of Ca2+ within rapidly exchanging organelles. The tentative name of calstorin (calcium-storage-protein, CST) is therefore proposed.

Original languageEnglish
Pages (from-to)828-833
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume203
Issue number2
DOIs
Publication statusPublished - 1994

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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