Phenylalanyl-tRNA synthetase beta chain (Phenylalanine--tRNA ligase beta chain) (PheRS); ATP + L-Phenylalanine + tRNA(Phe) <=> AMP + Pyrophosphate + L-Phenylalanyl-tRNA(Phe); Belongs to the phenylalanyl-tRNA synthetase beta subunit family. Type 1 subfamily.

GTP-binding protein LepA; Required for accurate and efficient protein synthesis under certain stress conditions. May act as a fidelity factor of the translation reaction, by catalyzing a one-codon backward translocation of tRNAs on improperly translocated ribosomes. Back-translocation proceeds from a post-translocation (POST) complex to a pre- translocation (PRE) complex, thus giving elongation factor G a second chance to translocate the tRNAs correctly. Binds to ribosomes in a GTP- dependent manner.

GMP synthase [glutamine-hydrolyzing] (Glutamine amidotransferase) (GMP synthetase); Catalyzes the synthesis of GMP from XMP.

Ribosomal RNA small subunit methyltransferase A; Specifically dimethylates two adjacent adenosines (A1518 and A1519) in the loop of a conserved hairpin near the 3'-end of 16S rRNA in the 30S particle. May play a critical role in biogenesis of 30S subunits.

Peptide chain release factor 1 (RF-1); Peptide chain release factor 1 directs the termination of translation in response to the peptide chain termination codons UAG and UAA.

Arginyl-tRNA synthetase (Arginine--tRNA ligase) (ArgRS); ATP + L-Arginine + tRNA(Arg) <=> AMP + Pyrophosphate + L-Arginyl-tRNA(Arg).

Preprotein translocase SecY subunit; The central subunit of the protein translocation channel SecYEG. Consists of two halves formed by TMs 1-5 and 6-10. These two domains form a lateral gate at the front which open onto the bilayer between TMs 2 and 7, and are clamped together by SecE at the back. The channel is closed by both a pore ring composed of hydrophobic SecY resides and a short helix (helix 2A) on the extracellular side of the membrane which forms a plug. The plug probably moves laterally to allow the channel to open. The ring and the pore may move independently.

CTP synthase (UTP--ammonia ligase) (CTP synthetase); Catalyzes the ATP-dependent amination of UTP to CTP with either L-glutamine or ammonia as the source of nitrogen. Regulates intracellular CTP levels through interactions with the four ribonucleotide triphosphates.

DNA-directed RNA polymerase subunit beta; DNA-dependent RNA polymerase catalyzes the transcription of DNA into RNA using the four ribonucleoside triphosphates as substrates.