Functionally different GPI proteins are organized in different domains on the neuronal surface

TY - JOUR

T1 - Functionally different GPI proteins are organized in different domains on the neuronal surface

AU - Madore, N

AU - Smith, K L

AU - Graham, C H

AU - Jen, A

AU - Brady, K

AU - Hall, S

AU - Morris, R

PY - 1999/12/15

Y1 - 1999/12/15

N2 - We have investigated the organization, on the plasma membrane and in detergent-insoluble membrane vesicles, of two neuronal glycosylphosphatidylinositol-anchored (GPI) proteins: Thy-1, a negative regulator of transmembrane signalling; and prion protein, whose rapid endocytosis and Cu2+ binding suggest that it functions in metal ion uptake. Prion protein occurred on the neuronal surface at high density in domains, located primarily at the cell body, which were relatively soluble in detergent. Thy-1, although much more abundantly expressed on neurons, occurred at lower density over much of the surface of neurites land in lower abundance at the cell body) in domains that were highly resistant to detergent solubilization, Detergent-insoluble membrane vesicles contained Thy-1 at a density similar to that on the neuronal surface. Vesicles containing each protein could be separated by immunoaffinity isolation; lectin binding showed that they were enriched in different glycoproteins. Our results demonstrate a structural diversity of the domains occupied by functionally different GPI proteins.

AB - We have investigated the organization, on the plasma membrane and in detergent-insoluble membrane vesicles, of two neuronal glycosylphosphatidylinositol-anchored (GPI) proteins: Thy-1, a negative regulator of transmembrane signalling; and prion protein, whose rapid endocytosis and Cu2+ binding suggest that it functions in metal ion uptake. Prion protein occurred on the neuronal surface at high density in domains, located primarily at the cell body, which were relatively soluble in detergent. Thy-1, although much more abundantly expressed on neurons, occurred at lower density over much of the surface of neurites land in lower abundance at the cell body) in domains that were highly resistant to detergent solubilization, Detergent-insoluble membrane vesicles contained Thy-1 at a density similar to that on the neuronal surface. Vesicles containing each protein could be separated by immunoaffinity isolation; lectin binding showed that they were enriched in different glycoproteins. Our results demonstrate a structural diversity of the domains occupied by functionally different GPI proteins.

UR - http://www.scopus.com/inward/record.url?scp=0033573083&partnerID=8YFLogxK

U2 - 10.1093/emboj/18.24.6917

DO - 10.1093/emboj/18.24.6917

M3 - Article

VL - 18

SP - 6917

EP - 6926

JO - EMBO Journal

JF - EMBO Journal

IS - 24

ER -