2JBH

Human phosphoribosyl transferase domain containing 1

Summary for 2JBH

• Entry DOI: 10.2210/pdb2jbh/pdb
• Descriptor: PHOSPHORIBOSYLTRANSFERASE DOMAIN-CONTAINING PROTEIN 1, PHOSPHATE ION, CALCIUM ION, ... (5 entities in total)
• Functional Keywords: glycosyltransferase, transferase, purine salvage
• Biological source: HOMO SAPIENS (HUMAN)
• Total number of polymer chains: 2
• Total formula weight: 52697.73

Authors

Welin, M.,Stenmark, P.,Arrowsmith, C.,Berglund, H.,Busam, R.,Collins, R.,Edwards, A.,Eklund, H.,Ericsson, U.B.,Flodin, S.,Flores, A.,Graslund, S.,Hammarstrom, M.,Hallberg, B.M.,Holmberg Schiavone, L.,Hogbom, M.,Johansson, I.,Karlberg, T.,Kotenyova, T.,Moche, M.,Nilsson, M.E.,Nyman, T.,Ogg, D.,Persson, C.,Sagemark, J.,Sundstrom, M.,Uppenberg, J.,Thorsell, A.G.,Van Den Berg, S.,Weigelt, J.,Nordlund, P. (deposition date: 2006-12-07, release date: 2006-12-20, Last modification date: 2024-10-23)

Primary citation

Welin, M.,Egeblad, L.,Johansson, A.,Stenmark, P.,Wang, L.,Flodin, S.,Nyman, T.,Tresaugues, L.,Kotenyova, T.,Johansson, I.,Eriksson, S.,Eklund, H.,Nordlund, P.
Structural and Functional Studies of the Human Phosphoribosyltransferase Domain Containing Protein 1.
FEBS J., 277:4920-, 2010

PubMed Abstract: Human hypoxanthine-guanine phosphoribosyltransferase (HPRT) (EC 2.4.2.8) catalyzes the conversion of hypoxanthine and guanine to their respective nucleoside monophosphates. Human HPRT deficiency as a result of genetic mutations is linked to both Lesch-Nyhan disease and gout. In the present study, we have characterized phosphoribosyltransferase domain containing protein 1 (PRTFDC1), a human HPRT homolog of unknown function. The PRTFDC1 structure has been determined at 1.7 Å resolution with bound GMP. The overall structure and GMP binding mode are very similar to that observed for HPRT. Using a thermal-melt assay, a nucleotide metabolome library was screened against PRTFDC1 and revealed that hypoxanthine and guanine specifically interacted with the enzyme. It was subsequently confirmed that PRTFDC1 could convert these two bases into their corresponding nucleoside monophosphate. However, the catalytic efficiency (k(cat)/K(m)) of PRTFDC1 towards hypoxanthine and guanine was only 0.26% and 0.09%, respectively, of that of HPRT. This low activity could be explained by the fact that PRTFDC1 has a Gly in the position of the proposed catalytic Asp of HPRT. In PRTFDC1, a water molecule at the position of the aspartic acid side chain position in HPRT might be responsible for the low activity observed by acting as a weak base. The data obtained in the present study indicate that PRTFDC1 does not have a direct catalytic role in the nucleotide salvage pathway.

PubMed: 21054786
DOI: 10.1111/J.1742-4658.2010.07897.X

Experimental method

X-RAY DIFFRACTION (1.7 Å)