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Derivativation of the human erythrocyte glucose transporter using a novel forskolin photoaffinity label

Conference · · Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States)
OSTI ID:6079157
; ;

An iodinated photoaffinity label for the glucose transporter, 3-iodo-4-azidophenethylamido-7-0-succinyldeacetyl-forskolin (IAPS-Fsk), has been synthesized, purified, and characterized. The K/sub i/ for inhibition of 3-0-methylglucose transport by TAPS-Fsk in human erythrocytes was found to be 0.1 uM. The carrier-free radioiodinated label has been shown to be a highly specific photoaffinity label for the human erythrocyte glucose transporter. Photolysis of erythrocyte membranes with 1-10 nM (I-125)IAPS-Fsk and analysis by SDS-PAGE showed specific derivatization of a broad band with an apparent molecular weight of 40-70 kDa. Photoincorporation using 2 nM (I-125)IAPS-Fsk was protected with D-glucose, cytochalasin B, and forskolin. No protection was observed with L-glucose. Endo-B-galactosidase digestion and trypsinization of (I-125)IAPS-Fsk labelled erythrocytes reduced the specifically radiolabelled transporter to 40 kDa and 18 kDa respectively. (I-125)-IAPS-Fsk will be used to study the structural aspects of the glucose transporter.

Research Organization:
Univ. of Wisconsin, Madison
OSTI ID:
6079157
Report Number(s):
CONF-870644-
Journal Information:
Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States), Journal Name: Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States) Vol. 46:6; ISSN FEPRA
Country of Publication:
United States
Language:
English

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Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ALDEHYDES
ANIMALS
BETA DECAY RADIOISOTOPES
BIOLOGICAL MATERIALS
BLOOD
BLOOD CELLS
BODY FLUIDS
CARBOHYDRATES
CELL CONSTITUENTS
CELL MEMBRANES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
DAYS LIVING RADIOISOTOPES
DECOMPOSITION
ELECTRON CAPTURE RADIOISOTOPES
ELECTROPHORESIS
ERYTHROCYTES
FRACTIONATION
GLUCOSE
HEXOSES
INTERMEDIATE MASS NUCLEI
IODINE 125
IODINE ISOTOPES
ISOTOPE APPLICATIONS
ISOTOPES
LABELLING
MAMMALS
MAN
MATERIALS
MEMBRANE TRANSPORT
MEMBRANES
MOLECULAR WEIGHT
MONOSACCHARIDES
NUCLEI
ODD-EVEN NUCLEI
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PRIMATES
PROTEINS
RADIOISOTOPES
SACCHARIDES
SEPARATION PROCESSES
TRACER TECHNIQUES
VERTEBRATES