FEATURES

FAMILY

DESCRIPTION

Also known as PAN3_PICST, PAN3. Regulatory subunit of the poly(A)-nuclease (PAN) deadenylation complex, one of two cytoplasmic mRNA deadenylases involved in mRNA turnover. PAN specifically shortens poly(A) tails of RNA and the activity is stimulated by poly(A)-binding protein PAB1. PAN deadenylation is followed by rapid degradation of the shortened mRNA tails by the CCR4-NOT complex. Deadenylated mRNAs are then degraded by two alternative mechanisms, namely exosome-mediated 3'-5' exonucleolytic degradation, or deadenlyation-dependent mRNA decaping and subsequent 5'-3' exonucleolytic degradation by XRN1. May also be involved in post-transcriptional maturation of mRNA poly(A) tails. PAN3 acts as a positive regulator for PAN activity, recruiting the catalytic subunit PAN2 to mRNA via its interaction with RNA and with PAB1. Homodimer. Forms a heterotrimer with a catalytic subunit PAN2 to form the poly(A)-nuclease (PAN) deadenylation complex. Interacts (via PAM-2 motif) with poly(A)-binding protein PAB1 (via PABC domain), conferring substrate specificity of the enzyme complex.

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EXTERNAL LINKS

PAN3

PAN2-PAN3 deadenylation complex subunit PAN3

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PAN3

Molecular Synopsis