Tags: Protein.
Phenylalanyl-tRNA synthetase beta chain is an enzyme that in humans is encoded by the FARSB gene.This gene encodes a highly conserved enzyme that belongs to the aminoacyl-tRNA synthetase class IIc subfamily. This enzyme comprises the regulatory beta subunits that form a tetramer with two catalytic alpha subunits. In the presence of ATP this tetramer is responsible for attaching L-phenylalanine to the terminal adenosine of the appropriate tRNA.