Protein Family Models

The N-terminal domain of the bacterial purine repressor PuR is a winged-helix domain, a subdivision of the HTH structural family. It consists of a canonical arrangement of secondary structures: a1-b1-a2-T-a3-b2-W-b3, where a2-T-a3 is the HTH motif, a3 is the recognition helix, and W is the wing. The domain allows for recognition of a conserved CGAA sequence in the centre of a DNA PurBox, resulting in binding to the major groove of DNA [1]. [1]. 12837783. The purine repressor of Bacillus subtilis: a novel combination of domains adapted for transcription regulation. Sinha SC, Krahn J, Shin BS, Tomchick DR, Zalkin H, Smith JL;. J Bacteriol. 2003;185:4087-4098. (from Pfam)

Date:

2024-10-16

This family includes a range of diverse phosphoribosyl transferase enzymes. This family includes: Adenine phosphoribosyl-transferase EC:2.4.2.7, Swiss:P07672. Hypoxanthine-guanine-xanthine phosphoribosyl-transferase Swiss:P51900. Hypoxanthine phosphoribosyl-transferase EC:2.4.2.8 Swiss:P36766. Ribose-phosphate pyrophosphokinase i EC:2.7.6.1 Swiss:P09329. Amidophosphoribosyltransferase EC:2.4.2.14 Swiss:P00496. Orotate phosphoribosyl-transferase EC:2.4.2.10 Swiss:P11172. Uracil phosphoribosyl-transferase EC:2.4.2.9 Swiss:P25532. Xanthine-guanine phosphoribosyl-transferase EC:2.4.2.22 Swiss:P00501. In Arabidopsis, At the very N-terminus of this domain is the P-Loop NTPase domain [1]. [1]. 17143579. Functional characterization of a gene encoding a dual domain for uridine kinase and uracil phosphoribosyltransferase in Arabidopsis thaliana. Islam MR, Kim H, Kang SW, Kim JS, Jeong YM, Hwang HJ, Lee SY, Woo JC, Kim SG;. Plant Mol Biol. 2007;63:465-477. (from Pfam)

Date:

2024-10-16

This HMM represents the puring operon repressor PurR of low-GC Gram-positive bacteria. This homodimeric repressor contains a large region homologous to phosphoribosyltransferases and is inhibited by 5-phosphoribosyl 1-pyrophosphate.

Gene:

purR

Date:

2021-08-31