The term "catalytic domain" refers to a specific part or region within a protein that has the ability to speed up a chemical reaction. It acts as a catalyst, initiating and facilitating the reaction to occur more quickly. Full definition
Rajan, I.; Savelieva, K.V.; Ye, G - L.; Wang, C - Y.; Malbari, M. M.; Friddle, C.; Lanthorn, T.H.; Zhang, W. Loss of the putative catalytic domain of HDAC4 leads to reduced thermal nociception and seizures while allowing normal bone development. (psychogenics.com)
The beta - ARK cDNA codes for a protein of 689 amino acids (79.7 kilodaltons) with a protein kinase catalytic domain that bears greatest sequence similarity to protein kinase C and the cyclic adenosine monophosphate (cyclic AMP)-- dependent protein kinase. (science.sciencemag.org)
The cytosolic catalytic domain consists of 3 A subunits and 3 B subunits, which bind and hydrolyze ATP, as well as regulatory accessory subunits. (ptglab.com)