Reference: Raue U, et al. (2007) Association of protein biogenesis factors at the yeast ribosomal tunnel exit is affected by the translational status and nascent polypeptide sequence. J Biol Chem 282(11):7809-16

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Abstract

Ribosome-associated protein biogenesis factors (RPBs) act during a short but critical period of protein biogenesis. The action of RPBs starts as soon as a nascent polypeptide becomes accessible from the outside of the ribosome and ends upon termination of translation. In yeast, RPBs include the chaperones Ssb1/2 and ribosome-associated complex (RAC), signal recognition particle (SRP), nascent polypeptide-associated complex (NAC), the aminopeptidases Map1 and Map2, and the N({alpha)}-terminal acetyltransferase NatA. Here, we provide the first comprehensive analysis of RPB-binding at the yeast ribosomal tunnel exit as a function of translational status and polypeptide sequence. We measured the ratios of RPBs to ribosomes in yeast cells, and determined RPB occupation of translating and non-translating ribosomes. The combined results imply a requirement for dynamic and coordinated interactions at the tunnel exit. Exclusively NAC was associated with the majority of ribosomes regardless of their translational status. All other RPBs occupied only ribosomal sub-populations, binding with increased apparent affinity to randomly translating ribosomes as compared to non-translating ones. Analysis of RPB interaction with homogenous ribosome populations engaged in the translation of specific nascent polypeptides revealed that the affinities of Ssb1/2, NAC, and, as expected, SRP, were influenced by the amino acid sequence of the nascent polypeptide. Complementary crosslinking data suggest that not only affinity of RPBs to the ribosome but also positioning can be influenced in a nascent polypeptide dependent manner.

Reference Type
Journal Article
Authors
Raue U, Oellerer S, Rospert S
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