biology

Herpesvirus glycoprotein B

Herpesvirus glycoprotein B is a biology 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 Herpesvirus glycoprotein B rather than just read about it. In short: Herpesvirus glycoprotein B is a viral glycoprotein that is involved in the viral cell entry of Herpes simplex virus (HSV). Herpesviruses have a lipid bilayer, called the envelope, which contains twelve surface glycoproteins.

Key takeaways

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

Reference excerpt

Herpesvirus glycoprotein B is a viral glycoprotein that is involved in the viral cell entry of Herpes simplex virus (HSV). Herpesviruses have a lipid bilayer, called the envelope, which contains twelve surface glycoproteins. For infectivity to be attained, the double stranded DNA genome of HSV must enter the host cell through means of fusion of its envelope with the cellular membrane or via endocytosis. Other viral glycoproteins involved in the process of viral cell entry include gC, gB, gD, gH, and gL, but only gC, gB, gD, and gH are required for the fusion of the HSV's envelope with the cellular membrane. It can be noted that all herpesviruses have glycoproteins gB, gH, and gL.

Structure The herpesvirus glycoprotein B is a type-1 transmembrane protein with a signal sequence at its N terminus. The crystal structure of herpes simplex virus (HSV) type-1 and Epstein–Barr virus glycoprotein B ectodomains were solved as a trimer, revealing five structural domains (I-V). Domain I contains two internal fusion loops, thought to insert into the cellular membrane during virus-cell fusion. In HSV, domain II is hypothesized to interact with another herpesvirus glycoprotein, gH/gL, during the fusion process. Domain III consists of a structurally important elongated alpha helix, while domain IV is hypothesized to interact with cellular receptors. Finally, domain V acts in conjunction with domain I during protein-lipid interactions. In HSV, neutralizing monoclonal antibodies map to structural domains I, II, IV and V. Due to its unique structure, herpesvirus glycoprotein B (along with vesicular stomatitis virus glycoprotein G and baculovirus gp64) belongs to a new class of viral membrane fusion glycoproteins, class III.

Function The herpesvirus glycoprotein B is the most highly conserved of all surface glycoproteins and acts primarily as a fusion protein. The precise functions of gB and gH/gL are unknown but they are required for viral entry into the cell and constitute the core fusion machinery. The claim that gB is involved in fusion comes from the notable syncytial phenotype caused by certain mutations within the cytoplasmic domain of glycoprotein B, as well as its structural homology to other viral fusion proteins.

References

Illustrations

Worked examples

Example 1 — a first encounter with Herpesvirus glycoprotein B

Start with the simplest possible case. Write down what Herpesvirus glycoprotein B claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Herpesvirus glycoprotein B 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 Herpesvirus glycoprotein B 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 Herpesvirus glycoprotein B

In research: Herpesvirus glycoprotein B appears in biology 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 Herpesvirus glycoprotein B 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: Herpesvirus glycoprotein B is common in secondary-school and first-year university syllabi. It links to neighbouring topics Herpes, Membrane protein stubs, Membrane proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Herpesvirus glycoprotein B 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 Herpesvirus glycoprotein B in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Herpesvirus glycoprotein B 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 Herpesvirus glycoprotein B out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Herpesvirus glycoprotein B in simple terms?

Why does Herpesvirus glycoprotein B matter?

Because it connects several biology 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 Herpesvirus glycoprotein B?

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 Herpesvirus glycoprotein B.