The length of peptide substrates has a marked effect on hydroxylation by the hypoxia-inducible factor prolyl 4-hydroxylases.


Three hypoxia-inducible factor prolyl 4-hydroxylases (HIF-P4Hs) regulate the HIFs by hydroxylating prolines at two separate sites in the oxygen-dependent degradation domain (ODDD) of their alpha subunits. We compared in vitro hydroxylation by purified recombinant human HIF-P4Hs of 19-20- and 35-residue peptides corresponding to the two sites in HIF-alphas… (More)


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