science

Lysostaphin

Lysostaphin is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Lysostaphin rather than just read about it. In short: Lysostaphin (EC 3.4.24.75, glycyl-glycine endopeptidase) is a Staphylococcus simulans metalloendopeptidase (crystal structure of lysostaphin). It can function as a bacteriocin (antimicrobial) against Staphylococcus aureus.

Key takeaways

Lysostaphin belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lysostaphin to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lysostaphin from memory before moving on to harder problems.

Reference excerpt

Lysostaphin (EC 3.4.24.75, glycyl-glycine endopeptidase) is a Staphylococcus simulans metalloendopeptidase (crystal structure of lysostaphin). It can function as a bacteriocin (antimicrobial) against Staphylococcus aureus. Lysostaphin is a 27 kDa glycylglycine endopeptidase, an antibacterial enzyme which is capable of cleaving the crosslinking pentaglycine bridges found in the cell wall peptidoglycan of certain staphylococci. Lysostaphin was first isolated from a culture of Staphylococcus simulans by Schindler and Schuhardt in 1964. S. aureus cell walls contain high proportions of pentaglycine, making lysostaphin a highly effective agent against both actively growing and quiescent bacteria. Staphylococcal infections of both Staphylococcus aureus and Staphylococcus epidermidis continue to be a major issue in clinical settings, particularly those with implantable devices. Staphylococci cause a significant percentage of device infections, and like many other pathogens, rather than living as free planktonic cells within the host they have the ability to form a multilayered community of sessile bacteria cells known as a biofilm on implantable devices. Once a staphylococcal biofilm has formed on an implanted medical device, it is difficult to disrupt due to its antibiotic resistance and protection against bacterial action. Many studies have been previously published on lysostaphin since its isolation, both in vitro and in vivo. Lysostaphin has been shown to eradicate susceptible S. aureus biofilms. It has also been reported to be effective in disrupting S. epidermidis biofilms in vitro, albeit at higher concentrations of the enzyme. Compared to commonly used antibiotics such as vancomycin, lysostaphin has been shown to demonstrate greater antibacterial activity in vitro. The enzyme has demonstrated effectiveness against methicillin susceptible S. aureus (MSSA) and methicillin resistant S. aureus (MRSA) mediated keratitis in vivo in a rabbit model. Additionally, it has been shown that lysostaphin combined with antimicrobials such as cefazolin, clarithromycin, doxycycline, levofloxacin, linezolid and quinuprisitin/dalfopristin has a synergistic effect for MSSA strains of the bacteria. A study published by Belyansky et al. illustrated that a lysostaphin bound mesh demonstrated dramatic preservation results in a rat model. Using lyostaphin to treat staphylococcal biofilm associated infections may prove to be preferable to using antibiotics as it may be possible to administer the enzyme at relatively low doses and disrupt a staphylococcal biofilm, therefore eliminating the need for surgical removal of the infected device.

References

External links The MEROPS online database for peptidases and their inhibitors: M23.004 Lysostaphin at the U.S. National Library of Medicine Medical Subject Headings (MeSH) EC 3.4.24.75

Illustrations

Worked examples

Example 1 — a first encounter with Lysostaphin

Start with the simplest possible case. Write down what Lysostaphin claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lysostaphin before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lysostaphin ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lysostaphin

In research: Lysostaphin appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lysostaphin in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lysostaphin is common in secondary-school and first-year university syllabi. It links to neighbouring topics Antimicrobial peptides, Bacterial toxins, Bactericides, so understanding it makes those chapters shorter.
In everyday life: Look for Lysostaphin outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Lysostaphin in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lysostaphin means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lysostaphin out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lysostaphin in simple terms?

Why does Lysostaphin matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lysostaphin?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lysostaphin.