An immunological comparison of several novel calcium-binding proteins

• Published in: The Journal of biological chemistry Vol. 261; no. 34; pp. 15815 - 15818
• Main Authors: Smith, V L, Dedman, J R
• Format: Journal Article
• Language: English
• Published: Bethesda, MD Elsevier Inc 05.12.1986; American Society for Biochemistry and Molecular Biology
• Subjects: Amino Acid Sequence; Analytical, structural and metabolic biochemistry; Animals; Annexins; Antibodies - immunology; Binding and carrier proteins; Biological and medical sciences; Calcium-Binding Proteins - analysis; Calcium-Binding Proteins - immunology; Calcium-Binding Proteins - physiology; Calreticulin; Cross Reactions; Fundamental and applied biological sciences. Psychology; Proteins; Rats; Ribonucleoproteins - analysis; Ribonucleoproteins - immunology; Ribonucleoproteins - physiology; Binding protein; Calcium; Antibody; Molecular weight; Immunological method
• ISSN: 0021-9258; 1083-351X
• DOI: 10.1016/S0021-9258(18)66634-7

Polyclonal antibodies prepared against each of the calcimedins were utilized to determine their tissue distribution. The immunological survey of rat tissues revealed that the levels of the 35-kDa calcimedin varied, while the amount of the 67-kDa calcimedin was relatively constant in the tissues examined. A new immunoreactive species, 52 kDa, was detected with the antibody to the 35-kDa calcimedin; this protein appears to be the predominant immunoreactive species in the tissues examined. Antibodies to the 35-kDa calcimedin were also used to compare many other calcium-binding proteins in order to determine immunological relationships. These comparisons demonstrate that the epidermal growth factor receptor/kinase substrate (p35), the src kinase substrate (pp36), and calregulin are immunologically unrelated to the calcimedins. However, it was found that the 67-kDa calcimedin and the p70 calelectrin are identical, as are the 35-kDa calcimedin and the p32.5 calelectrin. The calimedins are a subset of the chromobindins. In addition, the antibody to the 35-kDa calcimedin also cross-reacts with synexin, which may be related to the new 52-kDa immunoreactive protein identified.