#eukaryotic translation

Translation in Prokaryotes and Eukaryotes

Circularization of mRNA in eukaryotes is mediated by

High efficiency eukaryotic translation involves circularization of mRNA into a closed-loop topology that enhances recycling and stability. eIF4G acts as a large scaffold that simultaneously binds eIF4E attached to the 5' cap via its N-terminal domain and poly(A)-binding protein PABP bound to the 3' poly(A) tail via its C-terminal domain. The eIF4E-eIF4G-PABP interaction brings ends together, enhancing 40S subunit recycling from termination to initiation, stabilizing mRNA against deadenylation-mediated decay, and increasing affinity of eIF4F for cap. eIF2 delivers initiator tRNA and eEF2 controls translocation, neither mediating circularization directly in this model.

Ref: Alberts Fig 6-71 Closed-loop model; NCBI Review - eIF4G-PABP bridge circularizes mRNA to promote translation

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Translation in Prokaryotes and Eukaryotes

Cap binding protein in eukaryotes is

Cap-binding protein in eukaryotic cytosolic translation is eIF4E, 24 kDa subunit of eIF4F complex also containing scaffold eIF4G and helicase eIF4A. eIF4E specifically binds 7-methylguanosine cap structure at 5' end of mRNA via aromatic stacking interactions with tryptophan residues, recruiting mRNA to 43S pre-initiation complex for scanning. Activity controlled by binding proteins 4E-BPs that sequester eIF4E under nutrient deprivation, phosphorylation influencing affinity, and availability limiting translation of oncogenic growth factor mRNAs characterized by complex 5' UTRs requiring helicase action. This refined regulation supports accurate ribosomal assembly, quality control and translational fidelity under diverse physiological conditions and growth states.

Ref: Watson Molecular Biology of the Gene, 7th ed., Chapter 15, eIF4E cap-binding protein recognizing m7G cap

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Acid, Base, pH

5' cap helps translation by

recruiting ribosome is the scientifically accurate answer to this question. Within the study of Acid, Base, pH, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of recruiting ribosome directly address what is being asked. Among the other options, preventing degradation, splicing mRNA, and terminating translation do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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Acid, Base, pH

Consensus Kozak sequence is

G/ANNAUGG is the scientifically accurate answer to this question. Within the study of Acid, Base, pH, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of G/ANNAUGG directly address what is being asked. Among the other options, AGGAGG, TATAAT, and AAUAAA do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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Acid, Base, pH

Kozak sequence is found in

eukaryotic mRNA is the correct answer as it accurately identifies the biological location, composition, or distribution described in this question. In Acid, Base, pH, the spatial organization and localization of molecules are critical to their function. eukaryotic mRNA is specifically associated with the structure or compartment mentioned because of its unique biochemical properties and physiological role. The other options (prokaryotic mRNA, mitochondrial mRNA, and viral DNA) are primarily associated with different cellular compartments, tissues, or structural contexts.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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