scholarly journals Structure of the anion-transport protein of the human erythrocyte membrane. Further studies on the fragments produced by proteolytic digestion

1979 ◽  
Vol 181 (2) ◽  
pp. 477-493 ◽  
Author(s):  
D G Williams ◽  
R E Jenkins ◽  
M J A Tanner
Keyword(s):  
Erythrocyte Membrane ◽  
Human Erythrocyte ◽  
Peptide Mapping ◽  
Cytoplasmic Domain ◽  
Proteolytic Cleavage ◽  
Anion Transport ◽  
Transport Protein ◽  
Erythrocyte Membranes ◽  
Human Erythrocyte Membrane ◽  
Lectin Receptors

The topology of the human erythrocyte membrane anion-transport protein (band 3) has been investigated by isolation and peptide ‘mapping’ of the major and minor fragments derived from proteolytic cleavage of the lactoperoxidase 125I-labelled protein in erythrocytes and erythrocyte membranes. The content, in each fragment, of lactoperoxidase 125I-labelled sites (which have a known location in the extracellular or cytoplasmic domain of the protein), together with the location of the sites of proteolytic cleavage yielding the fragments, has allowed us to determine the alignment of the fragments on the linear amino acid sequence and to infer the topology of the polypeptide in the membrane. The results suggest that a region in the C-terminal portion of the polypeptide forms part of the cytoplasmic domain of the protein in addition to a large N-terminal segment. The membrane-bound regions of the protein are located in the C-terminal two-thirds of the molecule. In this region the polypeptide chain traverses the membrane at least four times and an additional loop of polypeptide is either embedded in the membrane or also penetrates through it to the other surface. The location of the lectin receptors on the protein and the site of binding of an anion-transport inhibitor have also been studied.

Conformation and stability of the anion transport protein of human erythrocyte membranes

Biochemistry ◽  
1985 ◽  
Vol 24 (12) ◽  
pp. 2843-2848 ◽  
Author(s):  
Kimio Oikawa ◽  
Debra M. Lieberman ◽  
Reinhart A. F. Reithmeier
Keyword(s):  
Human Erythrocyte ◽  
Anion Transport ◽  
Transport Protein ◽  
Erythrocyte Membranes ◽  
Human Erythrocyte Membranes

scholarly journals Electron microscope study of reassociation of spectrin and actin with the human erythrocyte membrane

1981 ◽  
Vol 90 (1) ◽  
pp. 70-77 ◽  
Author(s):  
S Tsukita ◽  
S Tsukita ◽  
H Ishikawa ◽  
S Sato ◽  
M Nakao
Keyword(s):  
Erythrocyte Membrane ◽  
Human Erythrocyte ◽  
Actin Filaments ◽  
Actin Polymerization ◽  
Erythrocyte Membranes ◽  
Human Erythrocyte Membrane ◽  
Thin Sections ◽  
Fixation Treatment ◽  
Human Erythrocyte Membranes ◽  
Inside Out

Reassociation of spectrin and actin with human erythrocyte membranes was studied by stereoscopic electron microscopy of thin sections combined with tannic acid- glutaraldehyde fixation. Treatment of the erythrocyte membrane with 0.1 mM EDTA (pH 8.0) extracted more than 90 percent of the spectrin and actin and concomitantly removed filamentous meshworks underlying the membranes, followed by fragmentation into small inside-out vesicles. When such spectrin-depleted vesicles were incubated with the EDTA extract (crude spectrin), a filamentous meshwork, similar to those of the original membranes, was reformed on the cytoplasmic surface of the vesicles. The filamentous components, with a uniform thickness of 9 nm, took a tortuous course and joined one another often in an end-to-end fashion to form a irregular but continuous meshwork parallel to the membrane. Purified spectrin was also reassociated with the vesicles in a population density of filamentous components almost comparable to that of the crude spectrin-reassociated vesicles. However, the meshwork formation was much smaller in extent, showing many independent filamentous components closely applied to the vesicle surface. When muscle G-actin was added to the crude spectrin- or purified spectrin- reassociated vesicles under conditions which favor actin polymerization, actin filaments were seen to attach to the vesicles through the filamentous components. Two modes of association of actin filaments with the membrane were seen: end-to-membrane and side-to- membrane associations. In the end-to-membrane association, each actin filament was bound with several filamentous components exhibiting a spiderlike configuration, which was considered to be the unit of the filamentous meshwork of the original erythrocyte membrane.

Proteins of Marsupial Erythrocyte Membranes

1985 ◽  
Vol 38 (1) ◽  
pp. 121 ◽  
Author(s):  
GB Ralston
Keyword(s):  
Erythrocyte Membrane ◽  
Human Erythrocyte ◽  
Sodium Dodecyl ◽  
Tammar Wallaby ◽  
Erythrocyte Membranes ◽  
Blue Staining ◽  
Human Erythrocyte Membrane ◽  
Coomassie Blue Staining ◽  
Red Kangaroo ◽  
Western Grey Kangaroo

The proteins of erythrocyte membranes from the red kangaroo, western grey kangaroo, eastern grey wallaroo (euro), red-necked wallaby, Tammar wallaby, and brush-tail possum have been fractionated on acrylamide gels in the presence of sodium dodecyl sulfate. The pattern of proteins was remarkably similar between the different marsupial species. The pattern of Coomassie blue-staining proteins in the membranes of these species was also very similar to that of the human erythrocyte membrane. However, the glycoproteins in the marsupial erythrocyte membranes were markedly less conspicuous than those of the human erythrocyte membrane. Furthermore, the mobilities of the glycoproteins from the marsupials were different from those of the human erythrocyte membrane.

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