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Poly(A) RNA and Paip2 act as allosteric regulators of poly(A)-binding protein.


ABSTRACT: When bound to the 3' poly(A) tail of mRNA, poly(A)-binding protein (PABP) modulates mRNA translation and stability through its association with various proteins. By visualizing individual PABP molecules in real time, we found that PABP, containing four RNA recognition motifs (RRMs), adopts a conformation on poly(A) binding in which RRM1 is in proximity to RRM4. This conformational change is due to the bending of the region between RRM2 and RRM3. PABP-interacting protein 2 actively disrupts the bent structure of PABP to the extended structure, resulting in the inhibition of PABP-poly(A) binding. These results suggest that the changes in the configuration of PABP induced by interactions with various effector molecules, such as poly(A) and PABP-interacting protein 2, play pivotal roles in its function.

SUBMITTER: Lee SH 

PROVIDER: S-EPMC3936760 | biostudies-literature | 2014 Feb

REPOSITORIES: biostudies-literature

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Poly(A) RNA and Paip2 act as allosteric regulators of poly(A)-binding protein.

Lee Seung Hwan SH   Oh Jungsic J   Park Jonghyun J   Paek Ki Young KY   Rho Sangchul S   Jang Sung Key SK   Lee Jong-Bong JB  

Nucleic acids research 20131129 4


When bound to the 3' poly(A) tail of mRNA, poly(A)-binding protein (PABP) modulates mRNA translation and stability through its association with various proteins. By visualizing individual PABP molecules in real time, we found that PABP, containing four RNA recognition motifs (RRMs), adopts a conformation on poly(A) binding in which RRM1 is in proximity to RRM4. This conformational change is due to the bending of the region between RRM2 and RRM3. PABP-interacting protein 2 actively disrupts the b  ...[more]

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