scholarly journals Solubilization and purification of the retinol-binding protein receptor from human placental membranes

1994 ◽  
Vol 302 (1) ◽  
pp. 245-251 ◽  
Author(s):  
A Sivaprasadarao ◽  
M Boudjelal ◽  
J B C Findlay
Keyword(s):  
Binding Protein ◽  
Binding Activity ◽  
Retinol Binding Protein ◽  
Protein Receptor ◽  
Sds Page ◽  
Minor Protein ◽  
Membrane Bound ◽  
Placental Membranes ◽  
Poly Ethylene ◽  
Solubilized Form

The membrane receptor for retinol-binding protein (RBP) has been solubilized from human placental brush-border membranes with octyl-beta-glucoside, Nonidet P-40 and CHAPS. A method, based on the preferential precipitation of 125I-RBP-receptor complex with poly(ethylene glycol) 8000, was developed in order to measure the RBP-binding activity in the detergent extracts. The receptor was fairly stable (4 degrees C, 7 days) in octyl-beta-glucoside and Nonidet P-40, but quickly lost activity in CHAPS. The detergent-solubilized form retained all the properties characteristic of the membrane-bound protein, except for a small decrease in affinity for RBP (3- and 7-fold in Nonidet P-40 and octyl-beta-glucoside respectively). The receptor was isolated using recombinant RBP coupled to Reacti-Gel 6X affinity matrix. The purified material contained major and minor protein species of 63 and 55 kDa respectively on SDS/PAGE.

scholarly journals Tissue distribution of the receptor for plasma retinol-binding protein

1995 ◽  
Vol 305 (2) ◽  
pp. 419-424 ◽  
Author(s):  
S Smeland ◽  
T Bjerknes ◽  
L Malaba ◽  
W Eskild ◽  
K R Norum ◽  
...  
Keyword(s):  
Tissue Distribution ◽  
Specific Binding ◽  
Binding Protein ◽  
Cell Types ◽  
Binding Activity ◽  
Retinol Binding Protein ◽  
Scatchard Analysis ◽  
High Binding ◽  
Differentiated Cells ◽  
Protein Receptor

The tissue distribution of the retinol-binding-protein receptor has been studied by using a cell-free binding assay. High binding activity was found in placenta, retina pigment epithelial cells, bone marrow and kidneys. Specific binding activity was also found in the small intestines, spleen and liver, and to a lesser extent in lung. Scatchard analysis revealed that the difference in binding activity was due to variations in receptor level and not affinity changes. When the kidneys were separated into cortex and medulla we found that almost all the specific binding activity present in kidneys was recovered in the cortex. The choroid plexus, an important site in the delivery of nutrients to the cerebrospinal fluid, expressed very high binding activity. The pineal gland, which has been shown to store vitamin A, also showed high binding activity. Testes from immature animals showed higher binding activity than testes from mature rabbits. Cultured undifferentiated kidney keratinocytes showed about 40 times higher binding activity than differentiated cells. Skin fibroblasts demonstrated no binding activity. In conclusion, the data presented in this report show that the level of the retinol-binding-protein receptor varies considerably between cell types. The observed tissue distribution of the receptor agrees well with the present knowledge on retinol function and metabolism by various cells.

Characterization of protein production by caprine placental membranes: identification and immunolocalization of retinol-binding protein

1995 ◽  
Vol 146 (3) ◽  
pp. 527-534 ◽  
Author(s):  
K H Liu ◽  
J C Huang ◽  
J D Godkin
Keyword(s):  
Protein Production ◽  
Culture Medium ◽  
De Novo ◽  
Binding Protein ◽  
Yolk Sac ◽  
Retinol Binding Protein ◽  
Minimum Essential Medium ◽  
Placental Membranes ◽  
Extraembryonic Membranes

Abstract Caprine chorion, allantois and amnion from days 23, 28, 35, 39 and 45, and yolk sac from day 23 of pregnancy were isolated by dissection and cultured for 24 h in modified minimum essential medium in the presence of [35S] methionine. De novo-synthesized proteins released into the culture medium were analyzed by two-dimensional PAGE and fluorography. Patterns of protein production by these isolated extraembryonic membranes remained relatively unchanged from days 23 to 45 of pregnancy. Electrophoretic profiles of proteins synthesized by allantois and amnion were identical but distinct from that produced by chorion. Yolk sac was the major source of serum-like proteins. An acidic (pI 5·3–6·3) 22 kDa protein, which consisted of four isoelectric variants, was produced by all extraembryonic membranes and demonstrated to immunoreact with antiserum produced against bovine placental retinol-binding protein (RBP). Limited N-terminal sequence analysis of one major isoform indicated that the protein had complete homology with bovine RBP over the first 15 amino acids. Immunoreactive RBP was localized in epithelial cells lining the chorion, allantois and amnion. In this study, we have characterized and compared protein production by isolated extraembryonic membranes through days 23 to 45 of pregnancy and identified the 22 kDa protein as caprine RBP of placental origin. Journal of Endocrinology (1995) 146, 527–534

scholarly journals Structural Studies of Retinol-Binding Protein Receptor RBPR2

2018 ◽  
Vol 114 (3) ◽  
pp. 424a
Author(s):  
Jonathan Kim ◽  
Yong Zi Tan ◽  
Brianna Costabile ◽  
Yunting Chen ◽  
Filippo Mancia
Keyword(s):  
Binding Protein ◽  
Retinol Binding Protein ◽  
Structural Studies ◽  
Protein Receptor

scholarly journals Mapping the Membrane Topology and Extracellular Ligand Binding Domains of the Retinol Binding Protein Receptor†

Biochemistry ◽  
2008 ◽  
Vol 47 (19) ◽  
pp. 5387-5395 ◽  
Author(s):  
Riki Kawaguchi ◽  
Jiamei Yu ◽  
Patrick Wiita ◽  
Mariam Ter-Stepanian ◽  
Hui Sun
Keyword(s):  
Ligand Binding ◽  
Binding Protein ◽  
Membrane Topology ◽  
Retinol Binding Protein ◽  
Binding Domains ◽  
Protein Receptor

Native Disulfide Bonds in Plasma Retinol-Binding Protein Are Not Essential for All-trans-Retinol-Binding Activity

2003 ◽  
Vol 2 (3) ◽  
pp. 243-248 ◽  
Author(s):  
Gabriel O. Reznik ◽  
Yong Yu ◽  
George E. Tarr ◽  
Charles R. Cantor
Keyword(s):  
Disulfide Bonds ◽  
Binding Protein ◽  
Binding Activity ◽  
Retinol Binding Protein ◽  
Plasma Retinol

scholarly journals The retinol-binding protein receptor STRA6 regulates diurnal insulin responses

2017 ◽  
Vol 292 (36) ◽  
pp. 15080-15093 ◽  
Author(s):  
Christy M. Gliniak ◽  
J. Mark Brown ◽  
Noa Noy
Keyword(s):  
Binding Protein ◽  
Retinol Binding Protein ◽  
Protein Receptor ◽  
Insulin Responses

scholarly journals Differential interactions of human kallikrein-binding protein and α1-antitrypsin with human tissue kallikrein

1990 ◽  
Vol 267 (1) ◽  
pp. 79-84 ◽  
Author(s):  
L M Chen ◽  
L Chao ◽  
R K Mayfield ◽  
J Chao
Keyword(s):  
Complex Formation ◽  
Human Serum ◽  
Human Tissue ◽  
Binding Protein ◽  
Binding Activity ◽  
Stable Complex ◽  
Tissue Kallikrein ◽  
Heat Stable ◽  
Sds Page ◽  
Alpha 1 Antitrypsin

The characteristics of a new kallikrein-binding protein in human serum and its activities were studied. Both the kallikrein-binding protein and alpha 1-antitrypsin form 92 kDa SDS-stable and heat-stable complexes with human tissue kallikrein. In non-SDS/PAGE, the mobility of these complexes differ. Complex-formation between kallikrein and the binding protein is inhibited by heparin, whereas that between kallikrein and alpha 1-antitrypsin is heparin-resistant. In normal or alpha 1-antitrypsin-deficient-serum, the amount of 92 kDa SDS-stable complex formed upon addition of kallikrein is not related to serum alpha 1-antitrypsin levels. The rate of complex-formation between kallikrein and the binding protein is 12 times higher than that between kallikrein and alpha 1-antitrypsin. Purified alpha 1-antitrypsin, which exhibits normal elastase binding, has a kallikrein-binding activity less than 5% of that of serum. Binding of tissue kallikrein in serum is not inhibited by increasing elastase concentrations, and elastase binding in serum is not inhibited by excess tissue kallikrein. A specific monoclonal antibody to human alpha 1-antitrypsin does not bind to either 92 kDa endogenous or exogenous kallikrein complexes isolated from human serum. The studies demonstrate a new tissue kallikrein-binding protein, distinct from alpha 1-antitrypsin, is present in human serum.

scholarly journals Cross Talk between Signaling and Vitamin A Transport by the Retinol-Binding Protein Receptor STRA6

2012 ◽  
Vol 32 (15) ◽  
pp. 3164-3175 ◽  
Author(s):  
D. C. Berry ◽  
S. M. O'Byrne ◽  
A. C. Vreeland ◽  
W. S. Blaner ◽  
N. Noy
Keyword(s):  
Vitamin A ◽  
Cross Talk ◽  
Binding Protein ◽  
Retinol Binding Protein ◽  
Protein Receptor ◽  
Vitamin A Transport

scholarly journals Solubilization and purification of a membrane-associated 3,3′,5-tri-iodo-l-thyronine-binding protein from rat erythrocytes

1990 ◽  
Vol 270 (3) ◽  
pp. 577-582 ◽  
Author(s):  
R C Angel ◽  
J A Botta ◽  
R D Morero ◽  
R N Farias
Keyword(s):  
Hormone Receptors ◽  
Specific Binding ◽  
Binding Protein ◽  
Active Form ◽  
Binding Activity ◽  
Erythrocyte Membranes ◽  
Major Protein ◽  
Sds Page ◽  
Affinity Labelling ◽  
Zwitterionic Detergent

3,3′,5-Tri-iodo-L-thyronine (L-T3) binding sites from rat erythrocyte membranes were solubilized in an active form by using the zwitterionic detergent CHAPS or the anionic detergent lauroylsarcosine. The binding protein was successively purified by Sephadex G-200 and affinity chromatography. The purified material retained its binding activity and exhibited high affinity and specificity compared with those displayed in the original membrane. Yield was about 10% of the starting activity. The specific binding activity was enriched by approx. 100-fold, which represents a purity of only 0.1%. Analysis of the purified preparation on SDS/PAGE showed two major protein bands (Mr 64,000 and Mr 50,000), but these could not represent the binding protein since the purity obtained was low. However, affinity-labelling experiments with N-bromoacetyl-L-[125I]T3 in intact membranes showed that two proteins (also with Mr values of 64,000 and 50,000) bound the hormone specifically, suggesting a co-migration of hormone receptors and contaminants on gel electrophoresis.

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