L-proline cis-3-hydroxylase 1 Dioxygenase that catalyzes the 2-oxoglutarate-dependent selective hydroxylation of free L-proline to cis-3-hydroxy-L- proline (cis-3-Hyp). D-proline, trans-4-hydroxy-L-proline, cis-4- hydroxy-L-proline, cis-4-hydroxy-D-proline, and 3,4-dehydro-DL- proline are not substrates. Proline 3-hydroxylase type I 290 Proline 3-hydroxylase 1 P3H1_STRSQ MRSHILGRIELDQERLGRDLEYLATVPTVEEEYDEFSNGFWKNIPLYNASGGSEDRLYRDLEGSPAQPTKHAEQVPYLNEIITTVYNGERLQMARTRNLKNAVVIPHRDFVELDRELDQYFRTHLMLEDSPLAFHSDDDTVIHMRAGEIWFLDAAAVHSAVNFAEFSRQSLCVDLAFDGAFDEKEAFADATVYAPNLSPDVRERKPFTKEREAGILALSGVIGRENFRDILFLLSKVHYTYDVHPGETFEWLVSVSKGAGDDKMVEKAERIRDFAIGARALGERFSLTTW