from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A subdivision of a larger unit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any subdivision of a larger unit
- n. A protein subunit
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a monetary unit that is valued at a fraction (usually one hundredth) of the basic monetary unit
Since the gamma subunit is asymmetrical it compels the beta subunits to undergo structural changes.
The gamma subunit is placed as an asymmetrical axle in the cylinder formed by the three alpha and the three beta subunits and has unique contacts with the beta units and forces their active surfaces to assume different three-dimensional structures.
Some seconds later the GTP, bound to the alpha-subunit, is hydrolysed to GDP.
The alpha and beta subunits in the F1 part, however, cannot rotate because they are locked in a fixed position by the b subunit, which is anchored to subunit a in the membrane.
The alpha subunit, which is the largest, can bind GTP.
Interestingly, most of the ribosomal proteins found in our study belong to the small, 40S ribosomal subunit, which is known to associate with another multiprotein factor that we have identified, the cap-binding complex eIF4F
We identified a hinge region, referred to as the subunit rotation motif (SRM), is responsible for transition between different RadA polymers.
HIFs are heterodimeric transcription factors, meaning that they consist of two subunits: an oxygen-sensitive α − subunit, which is the fundamental to the EPO mechanism, and a β − subunit.
The core enzyme consists of a 65 kDa scaffolding protein known as A subunit tethering a 36 kDa catalytic C subunit
This striking observation implies that Rho acts like a "subunit" of RNA polymerase that switches to the termination mode as soon as a sufficiently long segment of unprotected transcript emerges from RNA polymerase onto which Rho can load.