>cd03494 SQR_TypeC_SdhD Succinate:quinone oxidoreductase (SQR) Type C subfamily, Succinate dehydrogenase D (SdhD) subunit; SQR catalyzes the oxidation of succinate to fumarate coupled to the reduction of quinone to quinol. E. coli SQR, a member of this subfamily, reduces the high potential quinine, ubiquinone. SQR is also called succinate dehydrogenase or Complex II, and is part of the citric acid cycle and the aerobic respiratory chain. SQR is composed of a flavoprotein catalytic subunit, an iron-sulfur protein and one or two hydrophobic transmembrane subunits. Members of this subfamily are classified as Type C SQRs because they contain two transmembrane subunits and one heme group. SdhD and SdhC are the two transmembrane proteins of bacterial SQRs. They contain heme and quinone binding sites. The two-electron oxidation of succinate in the flavoprotein active site is coupled to the two-electron reduction of quinone in the membrane anchor subunits via electron transport through FAD an

Probab=97.76  E-value=0.001  Score=39.63  Aligned_cols=70  Identities=19%  Similarity=0.199  Sum_probs=58.9

Q ss_pred             HHHHHHHHHHHHHHHHHHHHHHHHHHCCCHHHHHHHHHCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHCCHH
Q ss_conf             999999999999999999999998516303554675306831699999999999999999899999852123
Q gi|254781041|r   27 IVHRITGSVVYLGTPVVVFWFFCIANGEHTLSSLRCYMDGSVFEVCLFLYTWAVIHHMLGGIRYLIWDVSLC   98 (129)
Q Consensus        27 I~HRitGi~l~~~~~~~~~~l~~~~~~~~~~~~~~~~~~~~~~k~~~~~~~~~~~yH~~nGiRHL~wD~g~g   98 (129)
T Consensus         3 l~QRvTAvil~~Y~~~l~~~~--~~~~~~~y~~W~~~f~~~~~ki~t~l~~~sl~~HAWIGlw~V~tDYi~~   72 (99)
T cd03494           3 LVQRVTAVIMALYTIFLVGFL--LASPPLTYEAWSGLFSSLWMKIFTLLALLALLLHAWIGLWDILTDYVKP   72 (99)
T ss_pred             HHHHHHHHHHHHHHHHHHHHH--HHCCCCCHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHCCH
T ss_conf             999999999999999999999--9869999999999997489999999999999999999688767872580