3.6.1.14 adenosine 5'-pentaphosphate + H2O - Saccharomyces cerevisiae ? - ? 141197 3.6.1.14 adenosine 5'-pentaphosphate + H2O hydrolyzed 18fold more slowly than adenosine 5'-tetraphosphate Lupinus luteus ? - ? 141197 3.6.1.14 adenosine 5'-pentaphosphate + H2O hydrolyzed at 1/200 the rate of adenosine 5'-tetraphosphate Lupinus luteus ? - ? 141197 3.6.1.14 adenosine 5'-tetraphosphate + H2O - Saccharomyces cerevisiae ATP + phosphate - ? 141196 3.6.1.14 adenosine 5'-tetraphosphate + H2O - Oryctolagus cuniculus ATP + phosphate - ? 141196 3.6.1.14 adenosine 5'-tetraphosphate + H2O - Lupinus luteus ATP + phosphate - ? 141196 3.6.1.14 alpha-beta-methylene-adenosine 5'-tetraphosphate + H2O - Homo sapiens alpha-beta-methylene-adenosine 5'-triphosphate + phosphate - ? 384160 3.6.1.14 alpha-beta-methylene-adenosine 5'-tetraphosphate + H2O - Lupinus luteus alpha-beta-methylene-adenosine 5'-triphosphate + phosphate - ? 384160 3.6.1.14 ATP + phosphate enzyme nicotinate phosphoribosyltransferase, EC 6.3.4.21, is able to generate adenosine 5'-tetraphosphate using substrate ATP and product phosphate. Accompanying a typically irreversible hydrolysis of ATP to ADP and phosphate, is a fully reversible phosphate transfer reaction between ATP and adenosine 5'-tetraphosphate Homo sapiens adenosine 5'-tetraphosphate + H2O - ? 443183 3.6.1.14 guanosine tetraphosphate + H2O - Saccharomyces cerevisiae GTP + phosphate - ? 141218 3.6.1.14 guanosine tetraphosphate + H2O - Lupinus luteus GTP + phosphate - ? 141218 3.6.1.14 inosine tetraphosphate + H2O - Saccharomyces cerevisiae ITP + phosphate - ? 141199 3.6.1.14 inosine tetraphosphate + H2O - Oryctolagus cuniculus ITP + phosphate - ? 141199 3.6.1.14 tripolyphosphate + H2O - Oryctolagus cuniculus diphosphate + phosphate - ? 141219 3.6.1.14 tripolyphosphate + H2O - Lupinus luteus diphosphate + phosphate - ? 141219