Electron affinity: The enthalpy change that results from adding an electron to a gaseous atom.

Electron affinity is becoming less negative (less exothermic) and less likely to gain an electron. 

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RBX1 is a RING finger–containing protein that binds the E2 ubiquitin-conjugating enzyme.

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phosphoserine/threonine-binding F-box protein is Skp2, which uses a series of leucine-rich repeats to bind to target proteins only when they are phosphorylated.

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APC/C consists of 14 core subunits in metazoans and 13 core subunits in yeast.

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APC/C works with substrate-targeting factors called Cdc20 and Cdh1

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APC/C core is organized into three modules: 

1. a scaffold module 

2. a catalytic module

3. a substrate recognition module