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FhuA (M r = 78 900) is an Escherichia coli outer membrane protein which transports the ferric siderophore ferrichrome and is the receptor for phage T5, 80 and T1 and for colicin M. FhuA was purified chromatographically in non-ionic detergent (octyl glucoside). The circular dichroism spectrum indicates that FhuA is essentially organized in β-strands like the majority of proteins of the...
In an attempt to better define the parameters governing reconstitution and two-dimensional crystallization of membrane proteins, we have studied Ca2(+)-ATPase from rabbit sarcoplasmic reticulum. This ion pump forms vanadate-induced crystals in its native membrane and has previously been reconstituted at high lipid-to-protein ratios for functional studies. We have characterized the reconstitution of...
The Ca2+ transport adenosine triphosphatase of sarcoplasmic reticulum was reconstituted in unilamellar liposomes prepared by reverse-phase evaporation. The size of the resulting proteoliposomes was similar to that of native sarcoplasmic reticulum vesicles, but their protein content was much lower, with a protein/lipid ratio (wt/wt) of 1:40–160, as compared with 1:1 in the native membrane. The proteoliposomes...
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