biology

Sorting and assembly machinery

Sorting and assembly machinery 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 Sorting and assembly machinery rather than just read about it. In short: The outer mitochondrial membrane is made up of two essential proteins, Tom40 and Sam50. Tom40 Tom40 is a protein import pore required for the import of precursor proteins across the outer mitochondrial membrane, and it makes up part of the translocase of the outer membrane.

Key takeaways

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

Reference excerpt

The outer mitochondrial membrane is made up of two essential proteins, Tom40 and Sam50.

Tom40 Tom40 is a protein import pore required for the import of precursor proteins across the outer mitochondrial membrane, and it makes up part of the translocase of the outer membrane.

Sam50 Sam50 is a subunit of the sorting and assembly machinery (SAM) of the outer membrane. The sorting and assembly machinery is a protein complex, that operates after the translocase of the outer membrane, to mediate insertion of beta barrel proteins into the outer mitochondrial membrane.

Complex components The sorting and assembly machinery is made up of three subunits, Sam35, Sam37, and Sam50, of which Sam50 is embedded within the outer mitochondrial membrane. Both Sam35 and Sam37 are located on the cytosolic face of the SAM complex are peripheral membrane proteins that are not essential for survival. Sam35 is believed to bind to substrate proteins, while Sam37 acts after Sam35 to stimulate release of the substrate protein from the SAM complex.

Protein import and integration The sorting and assembly machinery is required for the assembly of beta barrel proteins, this includes proteins such as the Tom40 import pore and porin. Like all mitochondrial proteins, beta barrel proteins are transported into the intermembrane space of mitochondria via the translocase of the outer membrane. Following import, beta barrel proteins are transported to the SAM complex by chaperone complexes, formed by assembly of the small Tim proteins. The complex formed by the three sorting and assembly machinery subunits (SAM core complex), is responsible for the integration of beta barrel proteins into the outer mitochondrial membrane. Mdm10 is another mitochondrial membrane protein, that is responsible for maintaining mitochondrial morphology and distribution. It has been found to interact with the SAM core complex, and may play a role in assembling Tom40 into the translocase of the outer membrane.

Notes

References Bolender, N., Sickmann, A., Wagner, R., Meisinger, C., Pfanner, N. (2008) Multiple pathways for sorting mitochondrial precursor proteins. EMBO J 9(1): 42-49. Chan, N.C, and Lithgow, T. (2008) The Peripheral Membrane Subunits of the SAM Complex Function Codependently in Mitochondrial Outer Membrane Biogenesis. Mol. Biol. Cell 19(1): 126-136.

Worked examples

Example 1 — a first encounter with Sorting and assembly machinery

Start with the simplest possible case. Write down what Sorting and assembly machinery 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 Sorting and assembly machinery 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 Sorting and assembly machinery 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 Sorting and assembly machinery

In research: Sorting and assembly machinery 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 Sorting and assembly machinery 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: Sorting and assembly machinery is common in secondary-school and first-year university syllabi. It links to neighbouring topics Membrane proteins, Mitochondrial proteins, so understanding it makes those chapters shorter.
In everyday life: Look for Sorting and assembly machinery 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 Sorting and assembly machinery in 20 minutes

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

Frequently asked questions

What is Sorting and assembly machinery in simple terms?

The outer mitochondrial membrane is made up of two essential proteins, Tom40 and Sam50. Tom40 Tom40 is a protein import pore required for the import of precursor proteins across the outer mitochondrial membrane, and it makes up part of the translocase of the outer membrane.

Why does Sorting and assembly machinery 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 Sorting and assembly machinery?

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 Sorting and assembly machinery.