Name: rna shapes and protein synthesis
Uploaded: 2025-05-22T09:05:39.000Z
Duration: 1 min 19 s
Channel: JoVE

K12 Standards

north-carolina-k-12-science-standard-course-of-study

NC K-12 Science Standard Course of Study

9-12

Biology

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms- Structures and Processes

LS.Bio.1.5

RNA Structure

Each molecule of ribonucleic acid, or RNA is composed of a chain of nucleotides. Each nucleotide consists of ribose, a five carbon sugar, attached to a phosphate group on one side and one of four nitrogenous bases on the other, adenine, guanine, cytosine, or uracil.
These bases bind to their complementary bases in DNA during transcription, when messenger RNA, mRNA, is synthesized. Adenine binds to thymine, guanine binds to cytosine, and uracil, which is used in RNA instead of thymine, binds to adenine.
The nucleotides are then linked together through phosphodiester bonds between the phosphate group of one nucleotide and a hydroxyl OH group on the ribose of the adjacent nucleotide, creating a sugar-phosphate backbone.
RNA molecules have a five prime end, with a phosphate group on the five prime carbon of ribose, and a three prime end, with a hydroxyl group on the three prime carbon. RNA is assembled in the five prime to three prime direction, and usually remains single-stranded.

rna structure

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form complex secondary and tertiary structures. Such structures play essential roles in the regulation of transcription and translation.
Different Types of RNA Have the Same Basic Structure
There are three main types of ribonucleic acid (RNA) involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). All three RNA types consist of a single-stranded chain of nucleotides. Each nucleotide is composed of the five-carbon sugar ribose. The carbon molecules of ribose are numbered one through five. Carbon number five is attached to a phosphate group, and carbon number one is attached to a nitrogenous base.
There are four nitrogenous bases in RNA&#8212;adenine (A), guanine (G), cytosine (C), and uracil (U). Uracil is the only base in RNA that is not present in DNA, which uses thymine (T) instead. During transcription, RNA is synthesized from a DNA template by complementary binding of the new RNA bases to the DNA bases; A binds to T, G binds to C, C binds to G, and U binds to A.
RNA Assembly Is Unidirectional
Like DNA, adjacent nucleotides in RNA are linked together through phosphodiester bonds. These bonds form between the phosphate group of one nucleotide and a hydroxyl (&#8211;OH) group on the ribose of the adjacent nucleotide.
This structure lends RNA its directionality&#8212;that is, the two ends of the chain of nucleotides are different. Carbon number five of ribose carries an unbound phosphate group, giving rise to the name 5&#8217; end. The last ribose at the other end of the nucleotide chain has a free hydroxyl (&#8211;OH) group at carbon number 3; hence, this end of the RNA molecule is called the 3&#8217; end. As nucleotides are added to the chain during transcription, the 5&#8217; phosphate group of the new nucleotide reacts with the 3&#8217; hydroxyl group of the growing chain. Therefore, RNA is always assembled in the 5&#8217; to 3&#8217; direction.
RNA Can Form Secondary Structures
Secondary structures are formed by complementary base pairing between distant nucleotides on the same single-stranded RNA. While hairpin loops are formed by pairing of bases within 5 to 10 nucleotides of each other, stem-loops are formed by pairing of bases separated by 50 to hundreds of nucleotides. In prokaryotes, these secondary structures function as transcriptional regulators. For instance, a hairpin loop in mRNA can serve as a termination signal. Transcription stops when RNA polymerase encounters the hairpin loop structure in mRNA and detaches from it. Stem-loops or hairpin loops at the 3&#8217; or 5&#8217; ends also regulate mRNA stability in eukaryotes by preventing the binding of ribonucleases&#8212;enzymes that degrade RNA.
Secondary structures can form more complicated tertiary structures called pseudoknots. Pseudoknots are formed when bases in the loop regions of secondary structures interact with complementary bases outside the loop. These tertiary structures play essential roles in RNA structure and function.
The Secondary and Tertiary Structure of tRNA Enables Protein Synthesis
tRNAs serve as adaptor molecules during the translation of mRNA into proteins. The three-dimensional structure of tRNA is L-shaped, with the amino acid binding site at one end and an anticodon at the other end. Anticodons are sequences of three nucleotides complementary to the mRNA codon&#8212;a sequence of three nucleotides that encode a specific amino acid. This unusual shape of the tRNA enables it to bind to ribosomes, where protein synthesis occurs. tRNA molecules are usually 70 to 80 nucleotides long and fold into a stem-loop structure that resembles a cloverleaf. Three of the four stems have loops containing 7-8 bases. The fourth stem is unlooped and includes the free 5&#8217; and 3&#8217; ends of the RNA strand. The 3&#8217; end acts as the amino acid acceptor site.

The basic structure of RNA consists of a string of ribonucleotides attached by phosphodiester bonds. Although most RNA is single-stranded, it can form ...

Education

JoVE Core

Cell Biology

Unit 1

Transcription: DNA to RNA

KEY TERMS AND CONCEPTS

rna shapes and protein synthesis

RNA shapes and protein synthesis are linked through the molecule’s single-stranded structure. RNA is made of ribonucleotides joined by phosphodiester bonds, and it can fold into secondary and tertiary shapes that help control transcription and translation. These shapes are important in both regulation and protein production.

Messenger RNA, transfer RNA, and ribosomal RNA are the three main RNA types used in protein synthesis. They all share the same basic build: a single strand of nucleotides. Each nucleotide contains the sugar ribose, a phosphate group on carbon 5, and a nitrogenous base on carbon 1.

RNA uses four bases: adenine, guanine, cytosine, and uracil. Uracil is found in RNA but not in DNA, which uses thymine instead. During transcription, RNA is copied from a DNA template by complementary base pairing. Adenine pairs with uracil in RNA, while the other pairing rules are G with C and C with G, and in DNA templates A pairs with T.

RNA grows in one direction because its nucleotides are linked by phosphodiester bonds. These bonds form between the phosphate group of one nucleotide and the hydroxyl group of the next ribose sugar. The chain has a 5' end with a free phosphate group and a 3' end with a free hydroxyl group, so RNA is assembled from 5' to 3'.

Single-stranded RNA can also fold back on itself. Nearby bases can pair to form hairpin loops, and bases farther apart can form stem-loops. In prokaryotes, these structures can help regulate transcription. A hairpin loop in mRNA can act as a stop signal when RNA polymerase reaches it and detaches.

Stem-loops and hairpins can also affect mRNA stability in eukaryotes. Structures near the 3' or 5' end can block ribonucleases, the enzymes that break down RNA. RNA can form even more complex tertiary structures called pseudoknots when loop bases pair with bases outside the loop. These shapes are important for RNA structure and function.

Transfer RNA, or tRNA, shows how RNA shape supports translation. tRNA acts as an adaptor during protein synthesis. It has an L-shaped three-dimensional form, with an amino acid binding site at one end and an anticodon at the other. The anticodon is a three-base sequence that matches the codon on mRNA.

tRNA usually contains 70 to 80 nucleotides and folds into a cloverleaf-like stem-loop pattern. Three stems have loops with 7 to 8 bases, and the fourth stem has the free 5' and 3' ends. The 3' end serves as the amino acid acceptor site, which helps tRNA bind to ribosomes where proteins are made.

RNA Shapes and Protein Synthesis

what is gene expression?

How Cells Control Gene Expression

Cells control gene expression to decide when a gene makes a protein. A gene is a stretch of DNA that holds the instructions for functional RNAs and proteins. Because DNA is built from nucleotides and proteins are built from amino acids, messenger RNA (mRNA) acts as the link between them. The first step is transcription. During transcription, mRNA copies the DNA blueprint. In eukaryotes, this happens in the nucleus through complementary base-pairing with the DNA template. The mRNA is then...

RNA shapes and protein synthesis are linked through the molecule’s single-stranded structure. RNA is made of ribonucleotides joined by phosphodiester bonds, and it can fold into secondary and tertiary shapes that help control transcription and translation. These shapes are important in both regulation and protein production. Messenger RNA, transfer RNA, and ribosomal RNA are the three main RNA types used in protein synthesis. They all share the same basic build: a single strand of nucleotides.

types of rna

RNA Roles in Protein Synthesis

RNA plays key roles in protein synthesis, and its main forms work together to make proteins in the cell. Messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA) each have a specific job. RNA can also be grouped as protein-coding or non-coding RNA. mRNA is the protein-coding RNA. It carries codons, which are sets of three nucleotides that specify an amino acid. tRNA and rRNA are non-coding RNAs. tRNA acts as an adaptor that reads the mRNA sequence and brings amino acids into the...

transcription

RNA Synthesis and Gene Control

Transcription is the process that makes RNA from a DNA sequence. RNA polymerase carries out this synthesis. It is the first step in turning a gene into a protein, and several other proteins and control sequences help make messenger RNA, or mRNA, correctly. In eukaryotes, DNA is first copied into pre-mRNA. This RNA can then be processed into mature mRNA, which serves as the template for protein synthesis. In prokaryotes, translation into a polypeptide can start before transcription has finished.

bacterial rna polymerase

Bacterial RNA Polymerase and Sigma Factor

Bacterial RNA polymerase carries out transcription, the process of copying DNA into RNA. It is the enzyme that starts RNA synthesis in bacteria and helps control which genes are used. The core enzyme works with a sigma factor, which is a protein that helps the polymerase find the right place to begin. Together, they form the holoenzyme. The sigma factor is important for promoter recognition, so the enzyme can bind near the start of a gene. Once transcription begins, RNA polymerase separates...

eukaryotic rna polymerases

Three Eukaryotic RNA Polymerases

Eukaryotic RNA polymerases are the enzymes that make RNA from DNA in cells with a nucleus. In eukaryotes, this work is divided among three main RNA polymerases. Each enzyme has a specific role in transcription, the process of copying genetic information into RNA. RNA polymerase I makes most ribosomal RNA, or rRNA. RNA polymerase II produces messenger RNA, or mRNA, which carries the instructions for making proteins. RNA polymerase III makes transfer RNA, or tRNA, and also some small RNAs used...

general transcription factors

Tissue-Specific Transcription Factors in Gene Control

Tissue-specific transcription factors help control which genes turn on in different mammal cells. These proteins bind to promoter sequences and can direct a gene to be expressed in one tissue but not another. This selective control helps cells carry out very different jobs in the body. A clear example is the beta globin gene, which makes part of hemoglobin. The gene is present in all body cells, but it is expressed only in red blood cells. That happens because the transcription factors needed...

rna polymerase ii accessory proteins

RNA Polymerase II Helper Proteins

RNA polymerase II helper proteins support the transcription process in eukaryotic cells. They work with RNA polymerase II, the enzyme that makes RNA from a DNA template. These proteins help the enzyme start, move, and finish transcription in the right way. Some helper proteins act as accessory factors. They can assist RNA polymerase II at different stages of gene expression. Their roles are important because transcription must be controlled accurately for cells to make the correct RNA...

transcription elongation factors

RNA Polymerase Pausing and Elongation

RNA polymerase pausing and elongation factors help control how RNA is made from DNA. During transcription, RNA polymerase moves along the gene and builds an RNA strand. Elongation factors support this process by helping the enzyme continue after it pauses. These factors are part of the elongation stage of transcription. They are not the same as the proteins used to start transcription. Their role is to keep RNA polymerase moving so RNA can be copied efficiently. In high school biology, this...

pre-mrna processing: modification of pre-mrna ends

pre-mrna-processing-modification-of-pre-mrna-ends

How Pre-mRNA Becomes Mature mRNA

Pre-mRNA becomes mature mRNA through a series of processing steps in eukaryotic cells. RNA polymerase first makes the transcript, and the RNA is modified before it leaves the nucleus. The unprocessed form is called precursor mRNA, or pre-mRNA, to separate it from mature mRNA. After about 20 to 40 ribonucleotides have been added, enzymes place a cap on the 5' end of the growing RNA. This cap replaces the 5' phosphate with modified guanosine, which carries a methyl group called 7-methyl...

pre-mrna processing: rna splicing

Pre-mRNA Splicing and Intron Removal

Pre-mRNA splicing removes introns from a pre-mRNA molecule and joins the remaining exons together. This step is part of pre-mRNA processing, which helps turn the first RNA copy into a mature message that can be used later in gene expression. Splicing is carried out by the spliceosome, a large RNA-protein complex. The spliceosome recognizes the intron boundaries and cuts out the intron. It then links the exons together in the correct order. A key feature of splicing is the lariat, a looped RNA...

chromatin structure and rna splicing

Chromatin and RNA Splicing Control

Chromatin and RNA splicing work together to shape how genes are used in a cell. Chromatin is the DNA-protein material that packages genetic information, and RNA splicing is a step in which introns are removed from a pre-mRNA transcript. The video explains how chromatin structure can influence this RNA processing step. A compact chromatin structure can make a gene less accessible, while a more open structure can make it easier for the cell to use that gene. This change in access can affect how...

alternative rna splicing

RNA Splicing in Gene Expression

RNA splicing in gene expression helps cells turn one gene into different RNA messages. During RNA processing, introns are removed and exons are joined together. This editing step changes which parts of the RNA stay in the final message. Alternative splicing gives cells a way to make more than one protein from the same gene. By including or skipping different exons, a cell can produce different RNA versions from one starting transcript. This process adds flexibility to gene expression without...

nuclear export of mrna

How mRNA Leaves the Nucleus

Messenger RNA, or mRNA, must move from the nucleus to the cytoplasm before it can be used to make protein. This step is called nuclear export of mRNA. It connects gene expression in the nucleus with protein production in the cytoplasm. During export, the cell selects mRNA molecules that are ready to leave the nucleus. These molecules pass through nuclear pores, which are openings in the nuclear envelope. The process helps keep mRNA transport organized and controlled. Once mRNA reaches the...

transfer rna synthesis

tRNA Genes and RNA Processing

Transfer RNA synthesis begins with transcription of tRNA genes into a primary RNA copy. That first copy is not yet ready to function in protein building. It must be processed before it can become mature transfer RNA. During processing, the cell trims the ends of the RNA and removes extra segments when needed. The transcript also shows that some transfer RNAs carry modified bases. These changes help create the final tRNA structure. Mature transfer RNA folds into a shape that can work in...

ribosomal rna synthesis

Ribosomal RNA and Ribosome Formation

Ribosomal RNA synthesis is part of how cells build ribosomes. Ribosomes are the structures that help make proteins. In this process, cells produce ribosomal RNA, or rRNA, which becomes a key part of the ribosome. The transcript focuses on the making of rRNA and its role in ribosome formation. Ribosomal RNA is not just a message like messenger RNA. It is a structural and functional part of the ribosome itself. Because of that, rRNA synthesis is closely tied to the assembly of ribosomes. This...

the nucleolus

Nucleolus and Ribosome Assembly

The nucleolus is a small structure inside the nucleus. It is the site where ribosome assembly begins. Ribosomes are the cell structures that help make proteins. The nucleolus forms around nucleolar organizer regions, or NORs. These regions contain the genes used to make ribosomal RNA, also called rRNA. Inside the nucleolus, rRNA is produced and combined with proteins to start building ribosomes. Because of this role, the nucleolus is closely tied to protein production in the cell. Its work...

additional subnuclear structures

Subnuclear Bodies and Their Roles

Subnuclear structures are specialized bodies inside the nucleus. They help organize nuclear activity and appear as distinct regions under the microscope. The nucleolus is one of the best-known subnuclear structures. It is the site where ribosomes begin to assemble. Cajal bodies are another nuclear structure. They are linked to the processing and assembly of RNA-related particles. These additional subnuclear structures show that the nucleus is not a uniform space. Instead, it contains...

key terms and concepts

Explore how RNA structure supports transcription and translation, from nucleotides and base pairing to hairpins, stem-loops, and tRNA shape.

RNA Shapes and Protein Synthesis | JoVE K12

cell biology

JoVE Core Cell Biology illustrates complex cellular processes in easy-to-understand yet comprehensive animated video lessons. This collection focuses on the essential components and functions of cells, including organelles and membranes, cellular transport, and cell energetics. It is complemented by scientist-in-action videos that demonstrate the application of cell biology in real-world research experiments.

Virginia  Standards of Learning

HIgh School

BIO.2

BIO.2.d

Minnesota Academic Standards in Science

Life Science

3.1.1 9L.3.1.1.4

Alabama Course of Study Science

From Molecules to Organisms: Structures and Processes

9-12.B.1.2

9-12.B.1.2.b

Next Generation Science Standards

High School

HS-LS1-1

Florida Department of Education

SC.912.L.16

SC.912.L.16.5

SC.912.L.16.6

SC.912.L.18

SC.912.L.18.1

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South Carolina College and Career Ready Science Standards

B-LS1-1.

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New York State Science Learning Standards

Structure and Function

HS-LS1-1.

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Cytoplasm

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The Nucleus

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Endoplasmic Reticulum

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Ribosomes

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Golgi Apparatus

As they leave the Endoplasmic Reticulum (ER), properly folded and assembled proteins are selectively packaged into vesicles. These vesicles are ...

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LS.Bio.1.3

Analyze how the relationship between structure and function supports life processes within organisms.

RNA Shapes and Protein Synthesis

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