>cd03214 ABC_Iron-Siderophores_B12_Hemin ABC transporters, involved in the uptake of siderophores, heme, and vitamin B12, are widely conserved in bacteria and archaea. Only very few species lack representatives of the siderophore family transporters. The E. coli BtuCD protein is an ABC transporter mediating vitamin B12 uptake. The two ATP-binding cassettes (BtuD) are in close contact with each other, as are the two membrane-spanning subunits (BtuC); this arrangement is distinct from that observed for the E. coli lipid flippase MsbA. The BtuC subunits provide 20 transmembrane helices grouped around a translocation pathway that is closed to the cytoplasm by a gate region, whereas the dimer arrangement of the BtuD subunits resembles the ATP-bound form of the Rad50 DNA repair enzyme. A prominent cytoplasmic loop of BtuC forms the contact region with the ATP-binding cassette and represent a conserved motif among the ABC transporters.

Probab=95.41  E-value=0.018  Score=35.04  Aligned_cols=28  Identities=32%  Similarity=0.548  Sum_probs=24.8

Q ss_pred             CCCCEEEEECCCCCCHHHHHHHHHHHHH
Q ss_conf             8886899867888797999999999999
Q gi|254780218|r    2 NSGLFISFEGIEGAGKTTHISLLKRFLQ   29 (225)
Q Consensus         2 ~~g~~I~iEGiDGsGKsTq~~~L~~~L~   29 (225)
T Consensus        23 ~~Ge~~~liG~nGsGKTTLl~~i~G~~~   50 (180)
T cd03214          23 EAGEIVGILGPNGAGKSTLLKTLAGLLK   50 (180)
T ss_pred             CCCCEEEEECCCCCCHHHHHHHHHCCCC
T ss_conf             6997999998999889999999957989