biology

Subtilase

Subtilase 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 Subtilase rather than just read about it. In short: Subtilases are a family of subtilisin-like serine proteases. They appear to have independently and convergently evolved an Asp/Ser/His catalytic triad, like in the trypsin serine proteases.

Key takeaways

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

Reference excerpt

Subtilases are a family of subtilisin-like serine proteases. They appear to have independently and convergently evolved an Asp/Ser/His catalytic triad, like in the trypsin serine proteases. The structure of proteins in this family shows that they have an alpha/beta fold containing a 7-stranded parallel beta sheet. The subtilisin family is the second largest serine protease family characterised to date. Over 200 subtilases are presently known, more than 170 of which with their complete amino acid sequence. Subtilase is widespread, being found in eubacteria, archaebacteria, eukaryotes and viruses. The vast majority of the family are endopeptidases, although there is an exopeptidase, tripeptidyl peptidase. Structures have been determined for several members of the subtilisin family showing that subtilisins exploit the same catalytic triad as the chymotrypsins although the residues occur in a different order (His/Asp/Ser in chymotrypsin and Asp/His/Ser in subtilisin); otherwise the structures show similarity to no other proteins. Some subtilisins are mosaic proteins, whereas others contain N- and C-terminal extensions that show no sequence similarity to any other known protein. Based on sequence homology, a subdivision into six families has been proposed. The proprotein-processing endopeptidases kexin, furin and related enzymes form a distinct subfamily known as the kexin subfamily (S8B). These preferentially cleave C-terminally to paired basic amino acids. Members of this subfamily can be identified by subtly different motifs around the active site. Members of the kexin family, along with endopeptidases R, T and K from the yeast Tritirachium and cuticle-degrading peptidase from Metarhizium, require thiol activation. This can be attributed to the presence of Cys-173 near to the active histidine. Only 1 viral member of the subtilisin family is known, a 56-kDa protease from herpes virus 1, which infects the channel catfish. Sedolisins (serine-carboxyl peptidases) are proteolytic enzymes whose fold resembles that of subtilisin; however, they are considerably larger, with the mature catalytic domains containing approximately 375 amino acids. The defining features of these enzymes are a unique catalytic triad, Ser/Glu/Asp, as well as the presence of an aspartic acid residue in the oxyanion hole. High-resolution crystal structures have now been solved for sedolisin from Pseudomonas sp. 101, as well as for kumamolisin from a thermophilic bacterium, Bacillus novo sp. MN-32. Mutations in the human gene leads to a fatal neurodegenerative disease.

Human proteins containing this domain FURIN; MBTPS1; PCSK1; PCSK2; PCSK4; PCSK5; PCSK6; PCSK7; PCSK9; TPP2;

References

External links Eukaryotic Linear Motif resource motif class CLV_PCSK_FUR_1 Eukaryotic Linear Motif resource motif class CLV_PCSK_PC1ET2_1 Eukaryotic Linear Motif resource motif class CLV_PCSK_PC7_1 Eukaryotic Linear Motif resource motif class CLV_PCSK_SKI1_1

Illustrations

Worked examples

Example 1 — a first encounter with Subtilase

Start with the simplest possible case. Write down what Subtilase 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 Subtilase 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 Subtilase 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 Subtilase

In research: Subtilase 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 Subtilase 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: Subtilase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 3.4.21, Proteases, Protein domains, so understanding it makes those chapters shorter.
In everyday life: Look for Subtilase 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Subtilase in 20 minutes

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

Frequently asked questions

What is Subtilase in simple terms?

Subtilases are a family of subtilisin-like serine proteases. They appear to have independently and convergently evolved an Asp/Ser/His catalytic triad, like in the trypsin serine proteases.

Why does Subtilase 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 Subtilase?

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 Subtilase.