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The 13-kD FK506 Binding Protein, FKBP13, Interacts with a Novel Homologue of the Erythrocyte Membrane Cytoskeletal Protein 4.1

Journal Article · · Journal of Cell Biology
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  1. Johns Hopkins University, Baltimore, MD (United States). School of Medicine; Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
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Here, we have identified a novel generally expressed homologue of the erythrocyte membrane cytoskeletal protein 4.1, named 4.1G, based on the interaction of its COOH-terminal domain (CTD) with the immunophilin FKBP13. The 129-amino acid peptide, designated 4.1G–CTD, is the first known physiologic binding target of FKBP13. FKBP13 is a 13-kD protein originally identified by its high affinity binding to the immunosuppressant drugs FK506 and rapamycin (Jin, Y., M.W. Albers, W.S. Lane, B.E. Bierer, and S.J. Burakoff. 1991. Proc. Natl. Acad. Sci. USA. 88:6677– 6681); it is a membrane-associated protein thought to function as an ER chaperone (Bush, K.T., B.A. Henrickson, and S.K. Nigam. 1994. Biochem. J. [Tokyo]. 303:705–708). We report the specific association of FKBP13 with 4.1G–CTD based on yeast two-hybrid, in vitro binding and coimmunoprecipitation experiments. The histidyl-proline moiety of 4.1G–CTD is required for FKBP13 binding, as indicated by yeast experiments with truncated and mutated 4.1G–CTD constructs. In situ hybridization studies reveal cellular colocalizations for FKBP13 and 4.1G–CTD throughout the body during development, supporting a physiologic role for the interaction. Interestingly, FKBP13 cofractionates with the red blood cell homologue of 4.1 (4.1R) in ghosts, inside-out vesicles, and Triton shell preparations. The identification of FKBP13 in erythrocytes, which lack ER, suggests that FKBP13 may additionally function as a component of membrane cytoskeletal scaffolds.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE; National Institutes of Health (NIH); United States Public Health Service (UPSHS)
DOE Contract Number:
AC02-05CH11231
OSTI ID:
2470569
Journal Information:
Journal of Cell Biology, Journal Name: Journal of Cell Biology Journal Issue: 1 Vol. 141; ISSN 0021-9525
Publisher:
Rockefeller University Press
Country of Publication:
United States
Language:
English

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59 BASIC BIOLOGICAL SCIENCES
Cell Biology