Two-dimensional crystallization of Ca-ATPase by detergent removal.
Two-dimensional crystallization of Ca-ATPase by detergent removal.
复制标题
通过去垢剂去除实现 Ca-ATP 酶的二维结晶。
DOI:
10.1016/s0006-3495(98)74050-0
复制
发表时间:
1998
影响因子:
3.4
通讯作者:
Rigaud,JL
中科院分区:
文献类型:
--
作者:
Lacapère,JJ;Stokes,DL;Olofsson,A;Rigaud,JL
By using Bio-Beads as a detergent-removing agent, it has been possible to produce detergent-depleted two-dimensional crystals of purified Ca-ATPase. The crystallinity and morphology of these different crystals were analyzed by electron microscopy under different experimental conditions. A lipid-to-protein ratio below 0.4w/w was required for crystal formation. The rate of detergent removal critically affected crystal morphology, and large multilamellar crystalline sheets or wide unilamellar tubes were generated upon slow or fast detergent removal, respectively. Electron crystallographic analysis indicated unit cell parameters ofa=159Å,b=54Å, andγ=90° for both types of crystals, and projection maps at 15-Å resolution were consistent with Ca-ATPase molecules alternately facing the two sides of the membrane. Crystal formation was also affected by the protein conformation. Indeed, tubular and multilamellar crystals both required the presence of Ca2+; the presence of ADP gave rise to another type of packing within the unit cell (a=86Å,b=77Å, andγ=90°), while maintaining a bipolar orientation of the molecules within the bilayer. All of the results are discussed in terms of nucleation and crystal growth, and a model of crystallogenesis is proposed that may be generally true for asymmetrical proteins with a large hydrophilic cytoplasmic domain.
登录
查看更多内容
影响因子:
5.6
作者:
J. Valpuesta;J. Carrascosa;R. Henderson
通讯作者:
R. Henderson
DOI:
10.1016/s0021-9258(18)83677-8
发表时间:
1989
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Sten Lunds;Stephane OrlowskiQ;Beatrice de Forestan;Phiiippe ChampeilQ;Marc le MaireT;Jesper;Mdler
通讯作者:
Mdler
DOI:
10.1016/s0021-9258(19)40236-6
发表时间:
1990
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
J. Lacapere;N. Bennett;Y. Dupont;F. Guillain
通讯作者:
F. Guillain
DOI:
--
发表时间:
1988
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Pikula,S;Mullner,N;Dux,L;Martonosi,A
通讯作者:
Martonosi,A
影响因子:
2.9
作者:
LUTSENKO, S;KAPLAN, JH
通讯作者:
KAPLAN, JH