engineering

Myosin-heavy-chain kinase

Myosin-heavy-chain kinase is a engineering 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 Myosin-heavy-chain kinase rather than just read about it. In short: In enzymology, a myosin-heavy-chain kinase (EC 2.7.11.7) is an enzyme that catalyzes the chemical reaction ATP + [myosin heavy-chain] ⇌ {\displaystyle \rightleftharpoons } ADP + [myosin heavy-chain] phosphate Thus, the two substrates of this enzyme are ATP and myosin heavy-chain, whereas its two products are ADP and myosin heavy-chain phosphate. This enzyme belongs to the family of transferases, specifically those t…

Key takeaways

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

Reference excerpt

In enzymology, a myosin-heavy-chain kinase (EC 2.7.11.7) is an enzyme that catalyzes the chemical reaction

ATP + [myosin heavy-chain] ⇌ {\displaystyle \rightleftharpoons } ADP + [myosin heavy-chain] phosphate Thus, the two substrates of this enzyme are ATP and myosin heavy-chain, whereas its two products are ADP and myosin heavy-chain phosphate. This enzyme belongs to the family of transferases, specifically those transferring a phosphate group to the sidechain oxygen atom of serine or threonine residues in proteins (protein-serine/threonine kinases). The systematic name of this enzyme class is ATP:[myosin heavy-chain] O-phosphotransferase. Other names in common use include

ATP:myosin-heavy-chain O-phosphotransferase calmodulin-dependent myosin heavy chain kinase MHCK MIHC kinase myosin heavy chain kinase myosin I heavy-chain kinase myosin II heavy-chain kinase [myosin-heavy-chain] kinase myosin heavy chain kinase A STK6.

References

Cote GP, Bukiejko U (1987). "Purification and characterization of a myosin heavy chain kinase from Dictyostelium discoideum". J. Biol. Chem. 262 (3): 1065–72. doi:10.1016/S0021-9258(19)75750-0. PMID 3027076. Hammer JA III, Albanesi JP, Korn ED (1983). "Purification and characterization of a myosin I heavy chain kinase from Acanthamoeba castellanii". J. Biol. Chem. 258 (16): 10168–75. doi:10.1016/S0021-9258(17)44620-5. PMID 6309772. Rieker JP, Swanljung-Collins H, Collins JH (1987). "Purification and characterization of a calmodulin-dependent myosin heavy chain kinase from intestinal brush border". J. Biol. Chem. 262 (31): 15262–8. doi:10.1016/S0021-9258(18)48169-0. PMID 2822719. Ravid S, Spudich JA (1989). "Myosin heavy chain kinase from developed Dictyostelium cells Purification and characterization". J. Biol. Chem. 264 (25): 15144–50. doi:10.1016/S0021-9258(18)63823-2. PMID 2549052. Brzeska H, Lynch TJ, Martin B, Corigliano-Murphy A, Korn ED (1990). "Substrate specificity of Acanthamoeba myosin I heavy chain kinase as determined with synthetic peptides". J. Biol. Chem. 265 (27): 16138–44. doi:10.1016/S0021-9258(17)46199-0. PMID 2168881. Ravid S, Spudich JA (1992). "Membrane-bound Dictyostelium myosin heavy chain kinase: a developmentally regulated substrate-specific member of the protein kinase C family". Proc. Natl. Acad. Sci. U.S.A. 89 (13): 5877–81. Bibcode:1992PNAS...89.5877R. doi:10.1073/pnas.89.13.5877. PMC 49400. PMID 1321427. Futey LM, Medley QG, Cote GP, Egelhoff TT (1995). "Structural analysis of myosin heavy chain kinase A from Dictyostelium. Evidence for a highly divergent protein kinase domain, an amino-terminal coiled-coil domain, and a domain homologous to the beta-subunit of heterotrimeric G proteins". J. Biol. Chem. 270 (2): 523–9. doi:10.1074/jbc.270.2.523. PMID 7822274. Korn ED, Brzeska H (1998). "Effect of mutating the regulatory phosphoserine and conserved threonine on the activity of the expressed catalytic domain of Acanthamoeba myosin I heavy chain kinase". Proc. Natl. Acad. Sci. U.S.A. 95 (8): 4146–51. Bibcode:1998PNAS...95.4146S. doi:10.1073/pnas.95.8.4146. PMC 22456. PMID 9539704. Egelhoff TT, Croft D, Steimle PA (2005). "Actin activation of myosin heavy chain kinase A in Dictyostelium: a biochemical mechanism for the spatial regulation of myosin II filament disassembly". J. Biol. Chem. 280 (4): 2879–87. doi:10.1074/jbc.M410803200. PMID 15545285.

Worked examples

Example 1 — a first encounter with Myosin-heavy-chain kinase

Start with the simplest possible case. Write down what Myosin-heavy-chain kinase claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In engineering, 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 Myosin-heavy-chain kinase 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 Myosin-heavy-chain kinase 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 Myosin-heavy-chain kinase

In research: Myosin-heavy-chain kinase appears in engineering 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 Myosin-heavy-chain kinase 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: Myosin-heavy-chain kinase is common in secondary-school and first-year university syllabi. It links to neighbouring topics EC 2.7.11, EC 2.7 stubs, Enzymes of unknown structure, so understanding it makes those chapters shorter.
In everyday life: Look for Myosin-heavy-chain kinase 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 Myosin-heavy-chain kinase in 20 minutes

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

Frequently asked questions

What is Myosin-heavy-chain kinase in simple terms?

In enzymology, a myosin-heavy-chain kinase (EC 2.7.11.7) is an enzyme that catalyzes the chemical reaction ATP + [myosin heavy-chain] ⇌ {\displaystyle \rightleftharpoons } ADP + [myosin heavy-chain] phosphate Thus, the two substrates of this enzyme are ATP and myosin heavy-chain, whereas its two pr…

Why does Myosin-heavy-chain kinase matter?

Because it connects several engineering 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 Myosin-heavy-chain kinase?

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 Myosin-heavy-chain kinase.