biology

Holo-(acyl-carrier-protein) synthase

Holo-(acyl-carrier-protein) synthase 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 Holo-(acyl-carrier-protein) synthase rather than just read about it. In short: In enzymology and molecular biology, a holo-[acyl-carrier-protein] synthase (ACPS, EC 2.7.8.7) is an enzyme that catalyzes the chemical reaction: CoA-[4'-phosphopantetheine] + apo-acyl carrier protein ⇌ {\displaystyle \rightleftharpoons } adenosine 3',5'-bisphosphate + holo-acyl carrier protein This enzyme belongs to the family of transferases, specifically those transferring non-standard substituted phosphate group…

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Reference excerpt

In enzymology and molecular biology, a holo-[acyl-carrier-protein] synthase (ACPS, EC 2.7.8.7) is an enzyme that catalyzes the chemical reaction:

CoA-[4'-phosphopantetheine] + apo-acyl carrier protein ⇌ {\displaystyle \rightleftharpoons } adenosine 3',5'-bisphosphate + holo-acyl carrier protein This enzyme belongs to the family of transferases, specifically those transferring non-standard substituted phosphate groups, and more specifically to the 4'-phosphopantetheinyl transferases (PPTases) named after the group they transfer. In mammals, this activity is performed by the PPTase, aminoadipate-semialdehyde dehydrogenase-phosphopantetheinyl transferase (AASDHPPT), which acts in both the cytosol and mitochondria. It acts on all substrates with an acyl carrier protein domain, which includes not only the "type II" mitochondrial ACP (NDUFAB1), but also the ACP part in "type I" proteins AASDH, ALDH1L1, ALDH1L2, and FASN. It also processes DHRS2, which does not have an ACP domain.

Function All ACPS enzymes known so far are evolutionally related to each other in a single superfamily of proteins. It transfers a 4'-phosphopantetheine (4'-PP) moiety from coenzyme A (CoA) to an invariant serine in an acyl carrier protein (ACP), a small protein responsible for acyl group activation in fatty acid biosynthesis. This post-translational modification renders holo-ACP capable of acyl group activation via thioesterification of the cysteamine thiol of 4'-PP. This superfamily consists of two subtypes: the trimeric ACPS type such as E. coli ACPS and the monomeric Sfp (PCP-synthesizing) type such as B. subtilis SFP. Structures from both families are now known. The active site accommodates a magnesium ion. The most highly conserved regions of the protein are involved in binding the magnesium ion.

Nomenclature The systematic name of this enzyme class is CoA-[4'-phosphopantetheine]:apo-[acyl-carrier-protein] 4'-pantetheinephosphotransferase. Other names in common use, disregarding the synthetase/synthase spelling difference, include acyl carrier protein holoprotein synthetase, holo-ACP synthetase, coenzyme A:fatty acid synthetase apoenzyme 4'-phosphopantetheine, acyl carrier protein synthetase (ACPS), PPTase, acyl carrier protein synthase, P-pant transferase, and CoA:apo-[acyl-carrier-protein] pantetheinephosphotransferase.

Structural studies As of late 2007, 8 structures have been solved for this class of enzymes, with PDB accession codes PDB: 1F7L, PDB: 1F7T, PDB: 1F80, PDB: 1FTE, PDB: 1FTF, PDB: 1FTH, PDB: 2JBZ, and PDB: 2JCA.

References

Illustrations

Worked examples

Example 1 — a first encounter with Holo-(acyl-carrier-protein) synthase

Start with the simplest possible case. Write down what Holo-(acyl-carrier-protein) synthase 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

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Example 3 — an exam-style question

Typical questions about Holo-(acyl-carrier-protein) synthase 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 Holo-(acyl-carrier-protein) synthase

In research: Holo-(acyl-carrier-protein) synthase 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 Holo-(acyl-carrier-protein) synthase 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: Holo-(acyl-carrier-protein) synthase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.7.8, EC 2.7 stubs, Enzymes of known structure, so understanding it makes those chapters shorter.
In everyday life: Look for Holo-(acyl-carrier-protein) synthase 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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Frequently asked questions

What is Holo-(acyl-carrier-protein) synthase in simple terms?

In enzymology and molecular biology, a holo-[acyl-carrier-protein] synthase (ACPS, EC 2.7.8.7) is an enzyme that catalyzes the chemical reaction: CoA-[4'-phosphopantetheine] + apo-acyl carrier protein ⇌ {\displaystyle \rightleftharpoons } adenosine 3',5'-bisphosphate + holo-acyl carrier protein Thi…

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