helicase

American

[hel-i-kays, hee-li-] / ˈhɛl ɪˌkeɪs, ˈhi lɪ- /

noun

Biochemistry.

any of the enzymes that use the energy derived from the hydrolysis of nucleoside triphosphates to unwind the double-stranded helical structure of nucleic acids.

RNA and DNA helicases.

Etymology

Origin of helicase

helic- + -ase

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

helicase

These exposed regions attract the BIR machinery, including PIF1, a helicase that is essential for BIR to operate.

From Science Daily ● Dec. 27, 2025

It would be difficult to create safe drugs that target the domains of the enzyme needed for protease or helicase functions, as human cells have many similar molecules.

From Science Daily ● Dec. 8, 2023

If helicase is mutated, the DNA strands will be separated at the beginning of replication.

From Textbooks ● Jun. 9, 2022

When an infected cell makes a new piece of the virus’s RNA, for example, a viral protein called a helicase has to unwind it before it can be packaged into a new virus shell.

From New York Times ● Dec. 7, 2021

Mcm10, together with ATP hydrolysis, then triggers further DNA untwisting and helicase activation.

From Nature ● Feb. 27, 2018

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023