An Enzyme | 05 Important Points

An Enzyme | 05 Important Points

An Enzyme

A brief review of the saci enzyme functions and expression has been presented in this article. It is now time to turn our attention to its applications. Let’s take a closer look at the enzyme’s expression and purification. Here are some of the key facts about the saci enzyme. You can also learn about its purification, function, and applications. And don’t forget to bookmark this page so you can come back to it later.

An Enzyme | 05 Important Points


SacI is the restriction enzyme that recognizes the GAG CTC site and cuts DNA best at 37 degrees C in its unique Buffer. The Reaction Conditions for Restriction Enzymes list the conditions under which the enzyme cuts DNA, including heat inactivation and double digestion. The enzyme is available as a FastDigest variant for rapid DNA digestion. This article explores the mechanisms underlying SacI digestion. This enzyme is essential for various applications, including gene editing and cloning.

SacI is a methylase-related enzyme that is produced by the bacterial cell. The gene of SacI endonuclease contains 1077 base pairs (bp) and encodes a 41-kDa protein. Its expression in various cells is necessary for the effective production of sacI enzyme. Many plasmid libraries harboring SacI endonuclease were cloned after the sacI enzyme gene was cloned.

To produce SacI, the scale gene in Streptomyces achromogenes was isolated. In contrast, the scale gene was inefficiently expressed in E. coli. The scale gene, which encodes SacI, has been isolated and purified. ACD and EDTA are anticoagulants that inhibit SacI. They require three times standard heparin for effective digestion.

Doxycycline inducible sacI restriction endonuclease has previously been described. These enzymes show symptoms of aging. Untreated livers and young mice exhibit signs of aging after DSB induction. Further, the sacI enzyme induces apoptosis and aging in the liver. These findings suggest that sacI restriction enzymes are a key player in a disease associated with aging.


Purification of sacI enzyme requires the expression of sacI from E. coli and subsequent purification. Purification is accomplished by conducting SacI activity at 37 degC for five to ten minutes. After this time, the enzyme is heat-inactivated at 80 degC for twenty minutes. This enzyme is suitable for research applications only and is not intended for therapeutic use. The sacI enzyme is also incompatible with the dam, DCM, or mammalian CpG methylation.

The Sac I enzyme is a restriction endonuclease produced by Streptomyces chromogens. Purification of sacI enzyme is a challenging procedure involving polyacrylamide gel electrophoresis under denaturing conditions. This procedure creates an electrophoretically homogeneous enzyme that yields a yield of 3.7%. It has a molecular weight of 52,000 +/ 5,000 D and an isoelectric point of 6.2. The enzyme contains two subunits and an isoelectric end of 6.2.

Three Types of Enzyme Inhibition

This restriction enzyme has a high-fidelity version called SacI-HF(r). This product from NEB is Time-Saver-qualified and 100% active in outsmarting Buffer. The search-HF(r) enzyme is stored in glycerol. However, the glycerol concentration should not exceed 10% in the reaction mix. If you plan to use larger DNA samples, you will need a larger restriction mix and a longer incubation time.


SacI is a restriction endonuclease originally isolated from Streptomyces chromogens ATCC 12767. It is first purified by a technique called electrophoresis under denaturing conditions to isolate the enzyme. This procedure yields a yield of 3.7% enzyme and a molecular weight of 52,000 +/ 5,000 D. The enzyme contains two subunits, and its isoelectric point is 6.2. SacI comprises two subunits, one of which recognizes GAG CTC, and the other is responsible for breaking down the DNA mentioned above sequences. This enzyme is available in two forms: a regular restriction digest and a FastDigest enzyme for rapid DNA digestion.

The methylase gene is expressed in both S. Stanford and S. chromogens. The SacI gene was homologous to the S locus in S. Stanford. This discovery helped determine the function of S. The SstI enzyme was expressed from the resulting plasmid. This study represents the first attempt to describe the SacI enzyme using a restriction enzyme.

S and SacI are types of restriction endonuclease genes. The S and SacI enzymes modify nucleotides with a recognition sequence, making the DNA more resistant to cleavage by a complementary restriction endonuclease. This restriction enzyme is often linked to a vector or structural gene. The saci enzyme protects host-cell DNA from division by the SstI endonuclease.

As new enzymes were discovered, the classical classification criteria were no longer applicable. A new classification system was developed to categorize the large enzyme family by deviations from classical standards. In this way, the Saci enzyme was classified into two distinct subfamilies. These new groups were given a letter suffix to differentiate them from the classical classification. It is important to note that each type of Saci enzyme has its distinct function in recognizing a specific sequence.


S and SacI enzymes are restriction endonucleases that modify nucleotides as part of a recognition sequence. These enzymes are attached to a host cell’s genetic material via a heterologous promoter. When SacI is expressed in a host cell, the enzyme is protected from cleavage by a complementary restriction endonuclease.

New England Biolabs began selling this enzyme in 1975, and several companies soon followed suit. It is a highly sensitive enzyme and is useful in several applications. The SacI enzyme recognizes the GAG CTC sites in DNA. The enzyme has high specific activity at 37 degrees Celsius in a special buffer. The SacI enzyme can also be purchased as a FastDigest enzyme for the rapid digestion of DNA.

The SacI enzyme was first isolated from a library of E. coli strain RR1. The transformed cells were then plated onto ampicillin-coated plates and analyzed for the presence of plasmid DNA. The clones that contained the SacI methylase gene were then purified and incubated with SacI endonuclease to detect such activity. Next, the short PCR products were sequenced to determine the specific SacI methylase gene.

Restriction endonucleases (RecA, SacI, and CpG) are useful tools in molecular biology and genetic engineering. These enzymes cleave DNA sequences at specific sites. As a result, they yield DNA fragments with known sequences. These enzymes are important tools for certain laboratory techniques, including genetic engineering and recombinant DNA technology. These enzymes are widely used in research and clinical settings and have been essential in many research studies.

Comparison with other restriction enzymes

The type I and type II restriction enzymes both cleave DNA at defined positions and close to their recognition site. Unlike the type I enzyme, they do not require ATP or AdoMet and have independent restriction activities. Both varieties produce discrete fragments that can be easily analyzed by sequence analysis. The differences between these types of enzymes are largely related to their structure and cleavage sites. These enzymes differ in the style and size of DNA fragments they generate.

DNA is generally formed from a ten base pair linker and a ten base complement to each strand. These two strands can be characterized by melting temperatures, from 41.5 degC to 57.7 degC. An enzyme needs to function at room temperature. Luckily, SmaI can cut the recognition site at room temperature. Most restriction enzymes work best at 37 degrees C.

While many restriction enzymes have similar characteristics, they differ in their ability to recognize and cleave DNA. Some cleave DNA at the recognition site, while others cut at a distinct point in the DNA strand. This makes them essential tools for molecular cloning and genetic engineering. But which enzyme is right for your experiment? Read on to learn more about the types of restriction enzymes. These enzymes are essential tools in genetic engineering and recombinant DNA technology.

A comparison of the various types of restriction enzymes is important. Each enzyme has different characteristics, ranging from pH requirements to the methylation status of DNA. The difference between Type I and Type II enzymes, is significant. The type I restriction enzyme MspI is the most common restriction enzyme. According to their activity sites, recognition sequences, and co-factors, they are classified into different groups. If you’re looking for a restriction enzyme to digest DNA, check out the comparison table below.

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