PROTEIN SYNTHESIS BY: SOPHIE GOLLAN. In this experiment we modelled the structure of DNA and the processes involved in protein synthesis from the information.

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Presentation transcript:

PROTEIN SYNTHESIS BY: SOPHIE GOLLAN

In this experiment we modelled the structure of DNA and the processes involved in protein synthesis from the information in the DNA

DNA STRUCTURE DNA - a double stranded helix molecule which consists of subunits called nucleotides. Each nucleotide contains a sugar, a phosphate, and a base. There are four bases: -adenosine -thymine -cytosine -guanine Alternate sugar and phosphates form the sides, and the bases are connected to the sugars making “rungs” like a ladder. The chemical structure of the bases allow them each to pair up with only one other base, thus they form complementary pairs. The complementary pairs are: -Adenosine and thymine -Cytosine and guanine

PROTEIN SYNTHESIS The information about the number, type and sequence of amino acids, needed to make a protein molecule, is found as a code in DNA. The code- a sequence of bases. One gene sequence codes for one polypeptide (a single chain of many amino acids) A set of 3 bases (a codon) codes for one amino acid of a polypeptide. A protein is one or more polypeptides.

EQUIPMENT 42 toothpicks 18 milk bottles cut in half (36 halves) – sugar 18 raspeberry lollies cut in half- phosphate 25 jelly beans cut in half (5 of each 5 colours)- bases: Adenosine- orange Thymine- purple Cytosine- pink Guanine- green Uracil- blue 4 jelly snake, aproxx. 6cm long, different colours A4 white paper representing a cell Colored paper circle, 6cm diameter- a ribosome Clean sharp knife Cutting board Gloves Scissors Marking pen Heinemann Biology textbook

TRANSCRIPTION A gene length of DNA unwinds in the nucleus. This is the area containing the information about the protein to be made.

R NA polymerase enzyme moves along the exposed single DNA strand linking complementary RNA nucleotides together to form a mRNA strand. RNA contains the base uracil where thymine is found in DNA. (uracil replaces thymine) The ‘start’ codon and the ‘stop’ codon control the length of the mRNA strand

The mRNA strand is then modified so that it only consists of the base sequence that will code for the protein. It removes the non-coding regions, introns, while still in the nucleus by splicing the coding regions, exons, together. The modified mRNA then moves from the nucleus into the cytoplasm

ACTIVATION OF AMINO ACIDS: In the cytoplasm, an enzyme attaches amino acids to tRNA molecules. Each type of amino acid is attached to its specific tRNA.

mRNA passing out of the nuclear pores into the cytoplasm triplet codons of tRNA with amino acids in the cytoplasm of the cell

TRANSLATION The start codon (AUG) end of the mRNA strand binds onto a ribosome. A tRNA carrying the amino acid methionine at one end and anticodon (UAC) at the other, binds to the mRNA start codon within the ribosome.

A second tRNA binds to the next codon. Its amino acid links to the polypeptide bond of the first amino acid. The first tRNA is released from the ribosome. The ribosome moves along the mRNA strand one codon at a time. Two tRNAs at a time are temporarily bound within the ribosome and their amino acids linked together Amino acid forming polypeptide bond (jelly snakes) Ribosome Triplet codon of tRNA mRNA strand DNA strand

A polypeptide chain forms (jelly snakes) Snakes form the polypeptide chain

When a ‘stop’ codon is reached the polypeptide chain is released into the cytoplasm Polypeptide chain

A polypeptide chain is only the primary structure of a protein. Each protein has a particular shape formed by the twisting or folding of its polypeptide chains Proteins are vital components of a cell.