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Structural and biochemical character...

Han, Yuchen.

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Structural and biochemical characterizations of the innate immune sensor/effector RNase L.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Structural and biochemical characterizations of the innate immune sensor/effector RNase L./
作者:	Han, Yuchen.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2016,
面頁冊數:	131 p.
附註:	Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
Contained By:	Dissertation Abstracts International78-04B(E).
標題:	Biochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10167482
ISBN:	9781369218312

Structural and biochemical characterizations of the innate immune sensor/effector RNase L.
Han, Yuchen.

Structural and biochemical characterizations of the innate immune sensor/effector RNase L. - Ann Arbor : ProQuest Dissertations & Theses, 2016 - 131 p.

Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.

Thesis (Ph.D.)--Princeton University, 2016.

One of the defensive mechanisms activated by type I interferons in human tissues involves synthesis of 2', 5'-linked oligoadenylates (2-5As) by the oligoadenylate synthetase (OAS) family members and cleavage of intracellular RNA by the 2-5A-dependent kinase-like endoribonuclease, RNase L. Despite its important roles that extend from innate immunity, the detailed mechanism of activation and cleavage-site selection of RNase L remained poorly known. Here, I have combined X-ray crystallography and biochemical studies to characterize RNase L in solution, elucidate its three-dimensional architecture in the presence of both 2-5A and RNA substrate, and explain its behavior upon activation.

ISBN: 9781369218312Subjects--Topical Terms:

518028
Biochemistry.

Structural and biochemical characterizations of the innate immune sensor/effector RNase L.
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245 1 0 $a Structural and biochemical characterizations of the innate immune sensor/effector RNase L.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2016
300 $a 131 p.
500 $a Source: Dissertation Abstracts International, Volume: 78-04(E), Section: B.
500 $a Adviser: Alexei V. Korennykh.
502 $a Thesis (Ph.D.)--Princeton University, 2016.
520 $a One of the defensive mechanisms activated by type I interferons in human tissues involves synthesis of 2', 5'-linked oligoadenylates (2-5As) by the oligoadenylate synthetase (OAS) family members and cleavage of intracellular RNA by the 2-5A-dependent kinase-like endoribonuclease, RNase L. Despite its important roles that extend from innate immunity, the detailed mechanism of activation and cleavage-site selection of RNase L remained poorly known. Here, I have combined X-ray crystallography and biochemical studies to characterize RNase L in solution, elucidate its three-dimensional architecture in the presence of both 2-5A and RNA substrate, and explain its behavior upon activation.
520 $a Our kinetic measurements, cross-linking assays, and size-exclusion chromatography analyses all converge to suggest that human RNase L forms high-order self-assemblies when reaching its fully active state, similar to the mode of activation of the phylogenetically related transmembrane kinase/RNase Ire1. The structural analysis of the N-terminal ankyrin-repeat (ANK) domain of RNase L in the presence and absence of 2-5A reveals that two molecules of 2-5A simultaneously tether two ANK domains to form a head-to-tail dimeric complex. Contrary to previous beliefs, this process does not involve any structural changes in the ANK domain.
520 $a To better understand domain interactions of RNase L, we have further obtained two crystal structures of nearly full-length human RNase L in complexes with synthetic or natural 2-5A, adenine nucleotides, and, for the first time, a fragment of RNA. Overall, RNase L forms a crossed homodimer by exchanging ANK domains, and positions two RNase domains for recognition and cleavage of RNA. Combined with corroborating biochemical studies, the partial RNA observed in the active site allowed us to unveil the UN.
520 $a N (.
520 $a denotes the cleavage site)rule that RNase L follows to select cleavage sites: one protomer of RNase L recognizes the identity nucleotide uridine, whereas the other protomer cleaves RNA between the two nucleotides immediately following the uridine. This mechanism readily explains the requirement of 2-5A-induced dimerization of RNase L for its activation. Furthermore, the UN.
520 $a N rule is consistent with the UG.
520 $a C cleavagepattern of Ire1, highlighting similarities between substrate selection and cleavage mechanisms employed by RNase L and Ire1.
590 $a School code: 0181.
650 4 $a Biochemistry. $3 518028
650 4 $a Biophysics. $3 518360
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710 2 $a Princeton University. $b Molecular Biology. $3 2101701
773 0 $t Dissertation Abstracts International $g 78-04B(E).
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791 $a Ph.D.
792 $a 2016
793 $a English
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