降解體

降解體（Degradosome）是存在於大多數細菌中的一種多亞基蛋白質複合物，其功能為參與核糖體RNA的加工以及信使RNA的降解，^[1]^[2]故又可稱為RNA降解體。

發現

1994年，瑞士日內瓦大學的Henry Krisch所領導的實驗室和英國劍橋大學的Christopher Higgins所領導的實驗室分別發表文章提出了細菌中存在著一種可以降解RNA的蛋白質複合物，也就是降解體；^[3]^[4]^[5]他們是在對大腸桿菌的RNase E和PNPase的研究和鑑定過程中得到這一發現。^[1]

組成

降解體的主要成分為核糖核酸酶E（RNase E）、多核苷酸磷酸化酶（PNPase）、RNase螺旋酶B（RhlB）和烯醇酶（enolase）。^[6]^[7]

參考文獻

^ ^1.0 ^1.1 （英文）Carpousis AJ. The RNA degradosome of Escherichia coli: an mRNA-degrading machine assembled on RNase E. Annu Rev Microbiol. 2007, 61: 71–87. PMID 17447862.
^ （英文）Carpousis AJ. The Escherichia coli RNA degradosome: structure, function and relationship in other ribonucleolytic multienzyme complexes. Biochem Soc Trans. 2002, 30: 150–155. PMID 12035760.
^ （英文）Carpousis AJ, Van Houwe G, Ehretsmann C, Krisch HM. Copurification of E. coli RNase E and PNPase: evidence for a specific association between two enzymes important in RNA processing and degradation. Cell. 1994, 76: 889–900.
^ （英文）Causton H, Py B, McLaren RS, Higgins CF. mRNA degradation in Escherichia coli: a novel factor which impedes the exoribonucleolytic activity of PNPase at stem-loop structures. Mol Microbiol. 1994, 14: 731–741.
^ （英文）Py B, Causton H, Mudd EA, Higgins CF. A protein complex mediating mRNA degradation in Escherichia coli. Mol Microbiol. 1994, 14: 717–729.
^ （英文）Miczak A, Kaberdin VR, Wei CL, Lin-Chao S. Proteins associated with RNase E in a multicomponent ribonucleolytic complex. Proc. Natl. Acad. Sci. USA. 1996, 93: 3865–3869.
^ （英文）Py B, Higgins CF, Krisch HM, Carpousis AJ. A DEAD-box RNA helicase in the Escherichia coli RNA degradosome. Nature. 1996, 381: 169–172.

參見

外切體

[Carpousis-1] 1.0 ^1.1 （英文）Carpousis AJ. The RNA degradosome of Escherichia coli: an mRNA-degrading machine assembled on RNase E. Annu Rev Microbiol. 2007, 61: 71–87. PMID 17447862.

[Carpousis2-2] （英文）Carpousis AJ. The Escherichia coli RNA degradosome: structure, function and relationship in other ribonucleolytic multienzyme complexes. Biochem Soc Trans. 2002, 30: 150–155. PMID 12035760.

[3] （英文）Carpousis AJ, Van Houwe G, Ehretsmann C, Krisch HM. Copurification of E. coli RNase E and PNPase: evidence for a specific association between two enzymes important in RNA processing and degradation. Cell. 1994, 76: 889–900.

[4] （英文）Causton H, Py B, McLaren RS, Higgins CF. mRNA degradation in Escherichia coli: a novel factor which impedes the exoribonucleolytic activity of PNPase at stem-loop structures. Mol Microbiol. 1994, 14: 731–741.

[5] （英文）Py B, Causton H, Mudd EA, Higgins CF. A protein complex mediating mRNA degradation in Escherichia coli. Mol Microbiol. 1994, 14: 717–729.

[6] （英文）Miczak A, Kaberdin VR, Wei CL, Lin-Chao S. Proteins associated with RNase E in a multicomponent ribonucleolytic complex. Proc. Natl. Acad. Sci. USA. 1996, 93: 3865–3869.

[7] （英文）Py B, Higgins CF, Krisch HM, Carpousis AJ. A DEAD-box RNA helicase in the Escherichia coli RNA degradosome. Nature. 1996, 381: 169–172.

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