The 90-kDa Component of Reticulocyte Heme-regulated EIF-2 Alpha (initiation Factor 2 Alpha-subunit) Kinase is Derived from the Beta Subunit of Spectrin

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1985 Aug 1

PMID 2410920

Authors

W Kudlicki

S Fullilove

G Kramer

B Hardesty

Affiliations

Soon will be listed here.

Abstract

Antibodies from three different lines of monoclonal hybridomas crossreact with both the beta subunit of spectrin and the 90-kDa peptide present in highly purified preparations of the heme-controlled eIF-2 alpha (initiation factor 2 alpha-subunit) kinase from rabbit reticulocytes. Antibodies from two of the three lines enhance the enzymatic activity of the kinase preparation for phosphorylation of the alpha subunit of eukaryotic translational initiation factor 2 (eIF-2) and for phosphorylation of the 100-kDa peptide thought to be a peptide of the kinase that is phosphorylated during its activation. Also, it is shown that both the beta subunit of spectrin and the 90-kDa peptide can be phosphorylated by two protein kinases from reticulocytes, the catalytic subunit of cAMP-dependent protein kinase and a cAMP-independent protein kinase similar to casein kinase II. Furthermore, a phosphorylated 90-kDa peptide can be derived from phosphorylated beta subunit of spectrin by tryptic proteolysis. We conclude that the 90-kDa peptide is derived by proteolysis from the beta subunit of spectrin, probably from its carboxyl terminus, and suggest that the heme-sensitive eIF-2 alpha kinase, like the 56-kDa phosphatase [Wollny, E., Watkins, K., Kramer, G. & Hardesty, B. (1984) J. Biol. Chem. 259, 2484-2492], is associated with an element of the membrane skeleton in intact reticulocytes.

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