Catalyzes the conversion of dihydroorotate to orotate with fumarate as the electron acceptor (By similarity). PYRDA_LACPL MGRLTVNLAGVTFKNPVMPASGTAAYGQQMAQQLDLSALGGLVIKSTTAEPKAGNPRPTTAETTAGWLNAIGLKNPGIDNVLADKLPWLATHYPDLPIIGSVAGASFDEYVAVARKMASAPNVKLLEINISCPNVDHGGLAFGTDPATVTALTKAIVAAVDKPVFMKLTPNVTDIVPIALAAEAGGAAGLTMINTLTGMGIDLATRQPILAHGTGGLSGKAIHPLAVRMIHDVRQHTKLPIIGVGGVFTPADVLEFYLAGANAVQVGAATYGHPTACTDIIAGLPAAMDQYGITSLQALIQEVQG lp_2699 305 pyrD Dihydroorotate dehydrogenase A (fumarate)