BamHI

Definition

BamHI is a type II restriction endonuclease enzyme that recognizes and cleaves a specific DNA sequence, making it a crucial tool in DNA sequencing and genetic engineering.

5 Must Know Facts For Your Next Test

1. BamHI recognizes and cleaves the palindromic DNA sequence 5'-GGATCC-3'.
2. The cleavage site for BamHI is between the two G's, leaving 4-nucleotide sticky ends.
3. BamHI is commonly used in DNA cloning and recombinant DNA technology to insert genes of interest into plasmid vectors.
4. BamHI is isolated from the bacterium Bacillus amyloliquefaciens, hence the name 'BamHI'.
5. BamHI is a type II restriction enzyme, meaning it requires no cofactors and cleaves DNA at a specific recognition sequence.

Review Questions

• Explain how the palindromic recognition sequence of BamHI is useful in DNA sequencing and genetic engineering.
  • The palindromic recognition sequence of BamHI, 5'-GGATCC-3', is useful in DNA sequencing and genetic engineering because it allows for the creation of 'sticky ends' when the enzyme cleaves the DNA. These sticky ends can then be used to ligate DNA fragments with compatible overhangs, facilitating the insertion of genes of interest into plasmid vectors for cloning and recombinant DNA experiments.
• Describe the role of BamHI in the process of DNA sequencing.
  • BamHI is a crucial tool in DNA sequencing because it can be used to cut DNA into smaller, manageable fragments that can then be sequenced. By recognizing and cleaving the specific palindromic sequence 5'-GGATCC-3', BamHI allows researchers to generate overlapping DNA fragments that can be assembled into a complete DNA sequence using bioinformatics tools. This process, known as shotgun sequencing, is a fundamental technique in modern genomics and DNA sequencing.
• Analyze how the unique properties of BamHI, such as its recognition sequence and cleavage pattern, make it a valuable enzyme in genetic engineering and recombinant DNA technology.
  • The unique properties of BamHI, including its recognition of the palindromic sequence 5'-GGATCC-3' and its ability to create 4-nucleotide sticky ends, make it a highly valuable enzyme in genetic engineering and recombinant DNA technology. The palindromic nature of the recognition sequence allows for the creation of compatible overhangs when the DNA is cleaved, facilitating the ligation of DNA fragments with complementary sticky ends. This enables the insertion of genes of interest into plasmid vectors, a fundamental process in the creation of recombinant DNA molecules. Additionally, the specific cleavage pattern of BamHI, leaving behind 4-nucleotide sticky ends, provides a reliable and predictable way to manipulate and assemble DNA sequences, making it a crucial tool in various genetic engineering applications, such as gene cloning, gene expression, and the construction of transgenic organisms.

Related terms

Restriction Enzyme: Enzymes that can recognize and cut DNA at specific nucleotide sequences, known as restriction sites.

Palindromic Sequence: A DNA sequence that reads the same in the 5' to 3' direction on both strands.

Sticky Ends: Single-stranded overhangs created by some restriction enzymes, which can be used to ligate DNA fragments together.