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蛋白質的碳端和氮端
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請教各位大俠,蛋白質的碳端和氮端難道是由很多個氨基酸組成的嗎? 我是一個剛開始接觸分子生物學的菜鳥,最近看論文講修飾c-terminal domain,沒太明白是什么意思。 Polytopic membrane proteins are essential for cellular uptake and release of nutrients. To prevent toxic accumulation, rapid shut-off mechanisms are required. Here we show that the soluble cytosolic carboxy terminus of an oligomeric ammonium transporter from Arabidopsis thaliana serves as an allosteric regulator essential for function; mutations in the C-terminal domain, conserved between bacteria, fungi and plants, led to loss of transport activity. When co-expressed with intact transporters, mutants inactivated functional subunits, but left their stability unaffected. Co-expression of two inactive transporters, one with a defective pore, the other with an ablated C terminus, reconstituted activity. The crystal structure of an Archaeoglobus fulgidus ammonium transporter (AMT)1 suggests that the C terminus interacts physically with cytosolic loops of the neighbouring subunit. Phosphorylation of conserved sites in the C terminus2 are proposed as the cognate control mechanism. Conformational coupling between monomers provides a mechanism for tight regulation, for increasing the dynamic range of sensing and memorizing prior events, and may be a general mechanism for transporter regulation. 我想咨詢下C-terminal 包含很多氨基酸嗎? 不是指的蛋白質末端的羧基? 膜蛋白的C terminal 是不是可以延伸到cytosol里很長? Co-expression of two inactive transporters, one with a defective pore, the other with an ablated C terminus, reconstituted activity. 這句話沒有明白是什么意思,怎么inactive的兩個蛋白一起表達就有了活性了? |
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