Words similar to hisrs
Example sentences for: hisrs
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In yeast and mammalian cells, GCN2 is a protein that senses amino acid starvation and brings about altered cell physiology in response to such starvation [ 24 25 ] . GCN2 is a protein kinase that phosphorylates the α subunit of the translation initiation factor eIF2 [ 26 ] . The GCN2 protein from yeasts, Drosophila , and mammals is composed of three domains: a pseudokinase domain that may function as a regulatory domain, a kinase domain, and a HisRS domain that shares significant similarity to histidyl-tRNA synthetases [ 27 28 29 30 ] . Studies of yeast GCN2 revealed that the HisRS domain binds uncharged tRNAs that accumulate when cells are starved for amino acids [ 31 32 ] . As a result the kinase domain is activated and phosphorylates eIF2α at Ser51.
The predicted amino acid sequences of IfkA and IfkB are nearly identical within the kinase domain and the HisRS domain, and in turn these two domains share significant sequence identity with GCN2 proteins from yeast, Drosophila , and mammals.
This includes the characteristic features peculiar to the kinase domain of GCN2 proteins, the m1, m2, and m3 motifs of the HisRS domain, and a cluster of positively charged residues at the C-terminus that are thought to function in ribosome binding and dimerization [ 31 37 41 ] . Within the kinase domain, the Dictyostelium proteins possess an inserted sequence between the 4th and 5th kinase subdomains that is also found in this position in all known GCN2-like proteins.
The sequence identity within the HisRS domain of IfkA/B and yeast GCN2 is 28%, with strong conservation within the M1, M2, and M3 motifs that are characteristic of class II aminoacyl-tRNA synthetases [ 37 ] . The similarity between the kinase domains is much higher, with IfkA/B possessing 44% identity with yeast GCN2, with high conservation of all of the kinase subdomains.
The two Ifk proteins possess all of the hallmarks of typical GCN2 proteins, including the characteristic kinase domain and the HisRS domain.
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