ribosome

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ribosome

 [ri´bo-sōm]
any of the intracellular ribonucleoprotein organelles concerned with protein synthesis, found either bound to cell membranes or free in the cytoplasm. They may occur singly or in clusters (polyribosomes). The genetic code is translated when ribosomes attach to messenger RNA.

ri·bo·some

(rī'bō-sōm),
A granule of ribonucleoprotein, 120-200 Ǻ in diameter, that is the site of protein synthesis from aminoacyl-tRNAs as directed by mRNAs.
Synonym(s): Palade granule

ribosome

/ri·bo·some/ (ri´bo-sōm) any of the intracellular ribonucleoprotein particles concerned with protein synthesis; they consist of reversibly dissociable units and are found either bound to cell membranes or free in the cytoplasm. They may occur singly or occur in clusters (polyribosomes).riboso´mal

ribosome

(rī′bə-sōm′)
n.
A structure composed of RNA and protein, present in large numbers in the cytoplasm of living cells and serving as the site for assembly of polypeptides encoded by messenger RNA.

ri′bo·so′mal (-sō′məl) adj.

ribosome

[rī′bəsōm]
Etymology: ribose + Gk, soma, body
an organelle composed of RNA and protein that functions in the synthesis of protein. Ribosomes interact with messenger RNA and transfer RNA to link amino acid into a polypeptide chain in a sequence determined by the sequence of nucleotides in the messenger RNA. Ribosomes may exist singly, in clusters as polysomes, or attached to the "rough" endoplasmic reticulum. See also translation.
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Ribosome

ri·bo·some

(rī'bŏ-sōm)
A granule of ribonucleoprotein, 120-150 Å in diameter, which is the site of protein synthesis from aminoacyl-tRNAs as directed by mRNAs.

ribosome

A spherical cell ORGANELLE made of RNA and protein which is the site of protein synthesis in the cell by linking amino acids into chains. Ribosomes may be free or may be attached to the endoplasmic reticulum. During translation, ribosomes attach to MESSENGER RNA molecules and travel along them, synthesizing polypeptides as they go.

ribosome

a small particle (not an ORGANELLE) found in the cytoplasm of all cells, composed of protein and RIBOSOMAL RNA. Each ribosome is composed of two subunits of different sizes which sediment at different rates during centrifugation (see ULTRACENTRIFUGE). PROKARYOTES have ribosome with 70 S size and mass; EUKARYOTES have larger ribosomes with 80 S size and mass. Ribosomes bind to the 5′ end of MESSENGER RNA (see POLYNUCLEOTIDE CHAIN) and travel towards the 3′ end, with TRANSLATION and POLYPEPTIDE synthesis occurring as they go along. Frequently several ribosomes are attached to one piece of mRNA, forming a POLYRIBOSOME.

Palade,

George Emil, Romanian-U.S. cell biologist and Nobel laureate, 1912–.
Palade granule - a granule of ribonucleoprotein, the site of protein synthesis from aminoacyl-tRNAs as directed by mRNAs. Synonym(s): ribosome
Weibel-Palade bodies - see under Weibel

ribosome

cell organelle; granule formed of ribonucleoprotein; site of protein synthesis, under influence of nuclear m-RNA

ribosome

ribonucleoprotein particles concerned with protein synthesis; they consist of two, one large and one small, reversibly dissociable units (called also 50S and 30S subunits) that are found either bound to cell membranes, particularly rough endoplasmic reticulum, or free in the cytoplasm. They may occur singly or in clusters, called polyribosomes or polysomes, which are ribosomes linked by mRNA and are actively engaged in protein synthesis.

ribosome binding site
a nucleotide sequence near the 5′ terminus of mRNA required for binding of mRNA to the small ribosomal subunit. Called also Shine-Dalgarno sequence.
References in periodicals archive ?
This study verified RPeL27, RPeL41, and RPeL43 as NPC-associated ribosomal protein genes as far as cell line system is concerned.
Ribosomal protein L23 activates p53 by inhibiting MDM2 function in response to ribosomal perturbation but not to translation inhibition.
Identification of the ribosomal proteins present in the vicinity of globin mRNA in the 40S initiation complex.
34) ** ([dagger]) ([dagger]) Drug resistance Linezolid (MIC, mg/L) R (32) R (32) Vancomycin (MIC, mg/L) S (2) S (2) Cefoxitin R R Gentamicin R R Tobramycin R R Ciprofloxacin R R Clindamycin R R Erythromycin S i Quinupristin-dalfopristin S S Chloramphenicol R R Tetracycline S S Cotrimoxazole R R Molecular features cfr gene - - 23S rRNA mutations T2504A + + G2631T + + T2530A + + L3 ribosomal protein mutations Leu94Val + ** Gly152Asp + ** Asp159Glu + ** Ala160Pro + ** L4 or L22 ribosomal None protein mutations Characteristic Patient no.
The ribosomal protein S6 (rpS6, S6) is a critical component of the 40S ribosomal subunit and the major phosphoprotein of the ribosome.
Ribosomal protein S6 phosphorylation is a determinant of cell size and glucose homeostasis.
Finally, significant changes in ribosomal protein mRNA were also observed in PB- and PTU-exposed animals.
This research has indicated, for example, that many ribosomal proteins and histone genes were found in growth-phase callus while genes encoding globulin and seed storage proteins such as glutelin and prolamine were identified in ripening panicles.
Interestingly, people with mutations in the same ribosomal protein can exhibit a range of very different symptoms.
ribosomal proteins, components of the mitochondrial respiratory chain, proteins involved in RNA metabolism, protein biosynthesis, or glucose and fatty acid metabolism.
The eukaryotic ribosome is composed of about 80 different ribosomal proteins and four rRNA moleculars, its primary function is protein synthesis (Kannan et al.

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