PMID: 9524356Apr 3, 1998Paper

Prolyl 4-hydroxylases and their protein disulfide isomerase subunit

Matrix Biology : Journal of the International Society for Matrix Biology
K I Kivirikko, J Myllyharju

Abstract

Prolyl 4-hydroxylases (EC 1.14,11.2) catalyze the formation of 4-hydroxyproline in collagens and other proteins with collagen-like sequences. The vertebrate type I and type II enzymes are [alpha (I)]2 beta 2 and [alpha (II)]2 beta 2 tetramers, respectively, whereas the enzyme from the nematode Caenorhabditis elegans is an alpha beta dimer. The type I enzyme is the major form in most but not all vertebrate tissues. The catalytic properties of the various enzyme forms are highly similar, but there are distinct, although small, differences in K(m) values for various peptide substrates between the enzyme forms and major differences in Ki values for the competitive inhibitor, poly(L-proline). Prolyl 4-hydroxylase requires Fe2+, 2-oxoglutarate, O2 and ascorbate. Kinetic studies and theoretical considerations have led to elucidation of the reaction mechanism, and recent extensive site-directed mutagenesis studies have identified five critical residues at the cosubstrate binding sites. A number of compounds have been characterized that inhibit it competitively with respect to some of the cosubstrates, and three groups of suicide inactivators have also been identified. The beta subunit in all forms of prolyl 4-hydroxylase is identical t...Continue Reading

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