Abstract
In this paper we review some of the large quantities of information currently available concerning the identification, structure and function of Ca2+-binding proteins of endoplasmic and sarcoplasmic reticulum membranes. The review places particular emphasis on identification and discussion of Ca2+ ‘storage’ proteins in these membranes. We believe that the evidence reviewed here supports the contention that the Ca2+-binding capacity of both calsequestrin and calreticulin favor their contribution as the major Ca2+-binding proteins of muscle and nonmuscle cells, respectively. Other Ca2+-binding proteins discovered in both endoplasmic reticulum and sarcoplasmic reticulum membranes probably contribute to the overall Ca2+ storage capacity of these membrane organelles, and they also play other important functional role such as posttranslational modification of newly synthesized proteins, a cytoskeletal (structural) function, or movement of Ca2+ within the lumen of the sarcoplasmic/endoplasmic reticulum towards the storage sites.
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Abbreviations
- SR:
-
Sarcoplasmic Reticulum
- ER:
-
Endoplasmic Reticulum
- InsP3 :
-
Inositol 1,4,5-trisphosphate
- SDS-PAGE:
-
Sodium Dodecyl Sulfate-Polyacrylamide Gel Electrophoresis
- PDI:
-
Protein Disulphide Isomerase
- T3BP:
-
Thyroid Hormone Binding Protein
- Grp:
-
Glucose regulated proteins
- HCP:
-
Histidine-rich Ca2+ binding Protein
- LDL:
-
Low Density Lipoprotein
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Milner, R.E., Famulski, K.S. & Michalak, M. Calcium binding proteins in the sarcoplasmic/endoplasmic reticulum of muscle and nonmuscle cells. Mol Cell Biochem 112, 1–13 (1992). https://doi.org/10.1007/BF00229637
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DOI: https://doi.org/10.1007/BF00229637