>cd02033 BchX Chlorophyllide reductase converts chlorophylls into bacteriochlorophylls by reducing the chlorin B-ring. This family contains the X subunit of this three-subunit enzyme. Sequence and structure similarity between bchX, protochlorophyllide reductase L subunit (bchL and chlL) and nitrogenase Fe protein (nifH gene) suggest their functional similarity. Members of the BchX family serve as the unique electron donors to their respective catalytic subunits (bchN-bchB, bchY-bchZ and nitrogenase component 1). Mechanistically, they hydrolyze ATP and transfer electrons through a Fe4-S4 cluster.

Probab=95.74 E-value=0.026 Score=37.91 Aligned_cols=167 Identities=19% Similarity=0.279 Sum_probs=93.2 Q ss_pred CCCCCCEEEEEECCCCCCHHHHHHHHHHHHHHHCCCCEEEECCCCC----CC--HHHHH---HHHHHHC------C---- Q ss_conf 0258841899623443334688999999998614895078205422----10--04779---9998510------3---- Q gi|254780711|r 95 LNAPSPLVIMLVGLQGSGKTTTTAKIAYHLKTLKKKKILMASLDVH----RP--AAQEQ---LRYLGEQ------I---- 155 (461) Q Consensus 95 ~~~~~p~vIllvGl~GsGKTTT~aKLA~~~~~~~~~kV~lv~~Dt~----R~--aA~eQ---L~~~a~~------~---- 155 (461) T Consensus 26 ~~~k~~~~IAiYGKGGIGKSTts~NlsAAlA~-~GkkVm~IGCDPKaDSTrlLlgG~~~~TVLd~~~~~~~~~e~v~~~d 104 (329) T cd02033 26 PPTKKTQIIAIYGKGGIGKSFTLANLSYMMAQ-QGKRVLLIGCDPKSDTTSLLFGGKACPTIIETSAKKKLAGEEVQIGD 104 (329) T ss_pred CCCCCCEEEEEECCCCCCHHHHHHHHHHHHHH-CCCEEEEECCCCCCCHHHHCCCCCCCCHHHHHHHHCCCCCCCCCHHH T ss_conf 87544549999768843561688999999997-79969997888846033410589888409999987288644342501 Q ss_pred ------CCCCCCCCCCCHH--------HHHHHHHHHHHH--HCCCCEEEEECCCCCCCHHHHHHHHHHHHHHCCCCCCCC Q ss_conf ------4742223321036--------899999999997--415886998334422211246899999985138511000 Q gi|254780711|r 156 ------QVDTLEVIPEQSP--------EKIAIRATQSAR--DGGYDAVILDTAGRNHINDSLMQEISEIKSLTNPHEILL 219 (461) Q Consensus 156 ------~v~~~~~~~~~dp--------~~i~~~a~~~a~--~~~~D~iiiDTaGR~~~d~~lm~El~~i~~~~~p~e~~l 219 (461) T Consensus 105 v~~~g~Gv~CvEsG-GPEPGvGCAGRGIItai~lLe~lg~~~~d~D~V~yDVLGDVVCGG-----FAmPiR~g~A~evyI 178 (329) T cd02033 105 VCFKRDGVFAMELG-GPEVGRGCGGRGIIHGFELLEKLGFHDWDFDYVLLDFLGDVVCGG-----FGLPIARDMAQKVIV 178 (329) T ss_pred EEECCCCEEEEECC-CCCCCCCCCCCCHHHHHHHHHHCCCCCCCCCEEEEECCCCEEECC-----CCCCCCCCCCCEEEE T ss_conf 78625998898667-999987678873013667877637752589999992245356646-----335335687628999 Q ss_pred CCCH--HCCHHHHHHH---HHHHHH---CCCCCEEEEECCCCCCCCHHHHHHHHHCCCHH Q ss_conf 3101--1122568888---988763---58440776411576633036777888478730 Q gi|254780711|r 220 VADA--LTGQDAVHLA---RNFDKI---VDLTGIILTRMDGDGRGGAALSMRTVTGKPIK 271 (461) Q Consensus 220 V~da--~~Gq~a~~~a---~~F~~~---~~i~giIlTKlD~~akgG~als~~~~~~~PI~ 271 (461) T Consensus 179 VtSgE~MalyAANNI~~~i~~~a~~gg~vrl~GlI~N~~~~~~e---~e~fa~~~g~~~l 235 (329) T cd02033 179 VGSNDLQSLYVANNVCNAVEYFRKLGGNVGVAGMVINKDDGTGE---AQAFAAHAGIPIL 235 (329) T ss_pred EECCCHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEECCCCCHH---HHHHHHHCCCCEE T ss_conf 96780889998878999999998638971011598606887249---9999997199579

HHsearch alignment for GI: 254780711 and conserved domain: cd02033