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Mike McGovern 《The journal of the Royal Anthropological Institute》2012,18(4):735-752
This article explores the ways that the institution of the avunculate has been used as an idiom for negotiating forced displacement, dispossession, and insecurity in the forested region where modern‐day Guinea, Liberia, Sierra Leone, and Côte d'Ivoire converge. The essay analyses the ways that the rights and responsibilities that inhere in the MB‐ZS relationship are both invoked ‘aspirationally’ by those with no prior link of kinship and parried by those who should in principle be bound by them. This degree of play suggests that the avunculate in this region is best understood as one of several idioms used to legitimate claims made on others, often in times of uncertainty and instability. Rather than treat this relationship as an always‐already existing social institution, the article suggests that it is also the product of a historical experience of persistent warfare, displacement, and flight. 相似文献
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Genetic analysis of the membrane insertion and topology of MalF, a cytoplasmic membrane protein of Escherichia coli 总被引:26,自引:0,他引:26
S Froshauer G N Green D Boyd K McGovern J Beckwith 《Journal of molecular biology》1988,200(3):501-511
MalF is an essential cytoplasmic membrane protein of the maltose transport system of Escherichia coli. We have developed a general approach for analysis of the mechanism of integration of membrane proteins and their membrane topology by characterizing a series of fusions of beta-galactosidase to MalF. The properties of the fusion proteins indicate the following. (1) The first two presumed transmembrane segments of MalF are sufficient to anchor beta-galactosidase firmly to the inner membrane. (2) Hybrid proteins with beta-galactosidase fused to a presumed cytoplasmic domain of MalF have high beta-galactosidase specific activity; fusions to periplasmic domains have low activity. We propose therefore, that periplasmic and cytoplasmic domains of integral membrane proteins can be distinguished by the enzymatic properties of such hybrid proteins. In general, it appears that cleaved or non-cleaved signal sequences when attached to beta-galactosidase cause it to become embedded in the membrane, and this results in the inability of the hybrid proteins to assemble into active enzyme. Additional properties of these fusion proteins contribute to our understanding of the regulation of MalF synthesis. The MalF protein, synthesized as part of the malEFG operon of E. coli, is approximately 30-fold less abundant in the cell than MalE protein (the maltose-binding protein). Differential amounts of the fusion proteins indicate that a regulatory signal occurs within the malF gene that is responsible for the step-down in expression from the malE gene to the malF gene. 相似文献
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