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A cluster of ribosomes that is connected by a strand of messenger RNA and is active in protein synthesis. Also called polysome.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Biochemistry) biochem an assemblage of ribosomes associated with a messenger RNA molecule, involved in peptide synthesis. Also called: polysome
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈpɒl iˌsoʊm)

a complex of ribosomes that lines up along a strand of messenger RNA and translates the genetic code during protein synthesis.
[1960–65; poly- + (ribo) some]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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They also exhibit elongated mitochondria with few crests, Golgi apparatus and large amounts of the smooth endoplasmic reticulum, ribosomes and free polyribosomes (Fig.
There is an increase in ribosomes, polyribosomes and cell organelles in cortical parenchyma (as inXiphinema galls) (Weischer & Wyss, 1976; Wyss, 1997, 2002) or in xylem parenchyma cells (as in Meloidogyne galls) (Bird, 1961; Yousif, 1979; Finley, 1981; Wyss, 1997, 2002; Di Vito et al., 2004) due to the nematodes feeding activity (Wyss, 1997).
Protein synthesis, polyribosomes, and peptide elongation in early development of Strongylocentrotus purpuratus.
La Regina et al., "Increased cytoplasmic TDP-43 reduces global protein synthesis by interacting with RACK1 on polyribosomes," Human Molecular Genetics, vol.
Polypeptides called procollagen chains are produced on polyribosomes bound to membranes of RER and translocated into the cisternae and the signal peptide is clipped off.
NR0B1 (DAX1) protein binds mRNAs associated with polyribosomes and regulates other gene expressions on the posttranscriptional level [9].
Association of the mouse infertility factor DAZL1 with actively translating polyribosomes. Biol Reprod 2000;62(6): 1655-1660.
Richter, "Human let7a miRNA blocks protein production on actively translating polyribosomes," Nature Structural and Molecular Biology, vol.
The results of the TEM showed that the adipocytes in the newly formed tissue were mature and had a well-developed nucleolus, a cytoplasm rich in ribosomes and polyribosomes, glycogen clusters, small lipid droplets, and large, dense mitochondria with variable amounts of cristae.
This would lead to the dissembly of polyribosomes (Lin and Glazer, 1981), incomplete methylation (Almstedt et al., 2010) and acceptor function of transfer RNA (Daskalakis et al., 2002).
These virus-like 30 ncRNAs are induced by ischemia and paradoxically bound to polyribosomes, although they are not translated.
Fragile-X mental retardation protein (FMRP) is a protein involved in ferrying RNA transcripts to polyribosomes located at sites of protein synthesis.