Protein: Translation initiation factor eIF2B subunit gamma (GCD complex subunit GCD1) (Guanine nucleotide exchange factor subunit GCD1) (eIF2B GDP-GTP exchange factor subunit gamma) (P09032)
Organism: Saccharomyces cerevisiae (strain ATCC 204508 / S288c) (Baker's yeast)
Function: Acts as essential component of the translation initiation factor 2B (eIF2-B or GCD complex), which catalyzes the exchange of eukaryotic initiation factor 2 (eIF-2)-bound GDP for GTP and is regulated by phosphorylated eIF-2. It activates the synthesis of GCN4 in yeast under amino acid starvation conditions by suppressing the inhibitory effects of multiple AUG codons present in the leader of GCN4 mRNA. It may promote either repression or activation of GCN4 expression depending on amino acid availability. GCD1 stabilizes the interaction between eIF-2 and GCD6 and stimulates the catalytic activity in vitro.
Subcellular location: Cytoplasm, cytosol {ECO:0000250|UniProtKB:P56288}.
Sequence: MSIQAFVFCGKGSNLAPFTQPDFPFQTQNKDSTAATSGDKLNELVNSALDSTVINEFMQHSTRLPKALLPIGNRPMIEYVLDWCDQADFKEISVVAPVDEIELIESGLTSFLSLRKQQFELIYKALSNSNHSHHLQDPKKINFIPSKANSTGESLQKELLPRINGDFVILPCDFVTDIPPQVLVDQFRNRDDNNLAMTIYYKNSLDSSIDKKQQQKQKQQQFFTVYSENEDSERQPILLDVYSQRDVTKTKYLQIRSHLLWNYPNLTVSTKLLNSFIYFCSFELCQLLKLGPQSMSRQASFKDPFTGNQQQQNPPTTDDDEDRNHDDDDDYKPSATSIQPTYFKKKNDLILDPINCNKSLSKVFRDLSRRSWQHSKPREPIGIFILPNETLFIRANNLNAYMDANRFVLKIKSQTMFTKNIQIQSAAIGADAIVDPKCQISAHSNVKMSVLGTQANIGSRCRVAGSLLFPGVHLGDEVILENCIIGPMAKIGSKCKLSNCYIEGHYVVEPKNNFKGETLANVYLDEDEEDELIYDDSVIAGESEIAEETDSDDRSDEDSDDSEYTDEYEYEDDGLFER
InterPro domains: - IPR011004: Trimeric LpxA-like superfamily (homologous_superfamily) [394-512]
- IPR029044: Nucleotide-diphospho-sugar transferases (homologous_superfamily) [55-495]
- IPR056818: Glucose-1-phosphate adenylyltransferase/Bifunctional protein GlmU-like, C-terminal hexapeptide (domain) [428-487]
- IPR051960: Eukaryotic Initiation Factor 2B Subunit Gamma (family) [2-521]
Interaction partners: - Eukaryotic translation initiation factor 2 subunit alpha
- Translation initiation factor eIF2B subunit epsilon
- Translation initiation factor eIF2B subunit alpha
- Translation initiation factor eIF2B subunit beta
- Eukaryotic translation initiation factor 2 subunit beta
- Translation initiation factor eIF2B subunit delta
- Eukaryotic translation initiation factor 2 subunit gamma
- Protein DSS4
- Protein LTV1
- GTP-binding protein GTR1
Gene Ontology annotations:
Molecular Function (MF): GO:0003674 (molecular function), GO:0098772 (molecular function regulator activity), GO:0030234 (enzyme regulator activity), GO:0140677 (molecular function activator activity), GO:0140678 (molecular function inhibitor activity), GO:0060589 (nucleoside-triphosphatase regulator activity), GO:0005085 (guanyl-nucleotide exchange factor activity), GO:0030695 (GTPase regulator activity)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0065007 (biological regulation), GO:0050789 (regulation of biological process), GO:0009987 (cellular process), GO:0009058 (biosynthetic process), GO:0044237 (cellular metabolic process), GO:0019222 (regulation of metabolic process), GO:0006807 (nitrogen compound metabolic process), GO:0050794 (regulation of cellular process), GO:0044238 (primary metabolic process), GO:0071704 (organic substance metabolic process), GO:0009889 (regulation of biosynthetic process), GO:0051171 (regulation of nitrogen compound metabolic process), GO:0060255 (regulation of macromolecule metabolic process), GO:0044249 (cellular biosynthetic process), GO:0031323 (regulation of cellular metabolic process), GO:0080090 (regulation of primary metabolic process), GO:1901564 (organonitrogen compound metabolic process), GO:1901576 (organic substance biosynthetic process), GO:0044260 (cellular macromolecule metabolic process), GO:0043170 (macromolecule metabolic process), GO:0006413 (translational initiation), GO:0019538 (protein metabolic process), GO:1901566 (organonitrogen compound biosynthetic process), GO:0006412 (translation), GO:0009059 (macromolecule biosynthetic process), GO:0034248 (regulation of amide metabolic process), GO:0010556 (regulation of macromolecule biosynthetic process), GO:0051246 (regulation of protein metabolic process), GO:0006446 (regulation of translational initiation), GO:0031326 (regulation of cellular biosynthetic process), GO:0043604 (amide biosynthetic process), GO:0044271 (cellular nitrogen compound biosynthetic process), GO:0034645 (cellular macromolecule biosynthetic process), GO:0010467 (gene expression), GO:0010468 (regulation of gene expression), GO:0043043 (peptide biosynthetic process), GO:2000112 (regulation of cellular macromolecule biosynthetic process), GO:0006417 (regulation of translation), GO:0010608 (post-transcriptional regulation of gene expression)
Cellular Component (CC): GO:0005575 (cellular component), GO:0032991 (protein-containing complex), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005851 (eukaryotic translation initiation factor 2B complex), GO:0005737 (cytoplasm), GO:0012505 (endomembrane system), GO:0031410 (cytoplasmic vesicle), GO:0043229 (intracellular organelle), GO:0005768 (endosome), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle), GO:0031982 (vesicle), GO:0097708 (intracellular vesicle)