HHsearch alignment for GI: 254780831 and conserved domain: cd02033

>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=99.88  E-value=1.2e-21  Score=164.17  Aligned_cols=222  Identities=22%  Similarity=0.321  Sum_probs=153.5

Q ss_pred             CCCEECCCCCCCCCHHHHHHHHHHHHCCCCCEEEEEECCCCCCCCCCEECCCCCCCCCCC---C-------CCCC--CCC
Q ss_conf             420102446665425789999898723577506988224678765310002456311233---4-------4576--632
Q gi|254780831|r   95 KKFVAVASGKGGVGKSTTVVNIACALKNKGKNVAILDADVYGPSIPKLLKISGKVEISDK---K-------FLKP--KEN  162 (341)
Q Consensus        95 ~~iiav~SgKGGVGKSt~s~nLa~ala~~G~~V~liDaDi~~ps~~~~lg~~~~~~~~~~---~-------~i~p--~~~  162 (341)
T Consensus        31 ~~~IAiY-GKGGIGKSTts~NlsAAlA~~GkkVm~IGCDPKaDSTrlLlgG~~~~TVLd~~~~~~~~~e~v~~~dv~~~g  109 (329)
T cd02033          31 TQIIAIY-GKGGIGKSFTLANLSYMMAQQGKRVLLIGCDPKSDTTSLLFGGKACPTIIETSAKKKLAGEEVQIGDVCFKR  109 (329)
T ss_pred             CEEEEEE-CCCCCCHHHHHHHHHHHHHHCCCEEEEECCCCCCCHHHHCCCCCCCCHHHHHHHHCCCCCCCCCHHHEEECC
T ss_conf             5499997-688435616889999999977996999788884603341058988840999998728864434250178625


Q ss_pred             CCEEECCCCCCCCCCCCCCCCCCCHH-HHHHHHHHHHCCCCCCEEEEECCCCCCCCCCHHHHCCC-----CCCEEEEECC
Q ss_conf             23032233343552210001342024-78999867521377758997455644421000000022-----3402674214
Q gi|254780831|r  163 YGIKIMSMASLVDENVAMIWRGPMVQ-SAIMHMLHNVVWGQLDFLLIDMPPGTGDAHLTIAQKIP-----LSGVVIVSTP  236 (341)
Q Consensus       163 ~gi~~~s~g~l~~~~~~~~~rg~~~~-~~l~~~l~~~~w~~~D~liiD~ppG~gd~~lsl~~~~~-----~~~~iiVttP  236 (341)
T Consensus       110 ~Gv~CvEsG-GPEPGvGCAGRGIItai~lLe~l-g-~~~~d~D~V~yDV---LGDVVCGG-FAmPiR~g~A~evyIVtSg  182 (329)
T cd02033         110 DGVFAMELG-GPEVGRGCGGRGIIHGFELLEKL-G-FHDWDFDYVLLDF---LGDVVCGG-FGLPIARDMAQKVIVVGSN  182 (329)
T ss_pred             CCEEEEECC-CCCCCCCCCCCCHHHHHHHHHHC-C-CCCCCCCEEEEEC---CCCEEECC-CCCCCCCCCCCEEEEEECC
T ss_conf             998898667-99998767887301366787763-7-7525899999922---45356646-3353356876289999678


Q ss_pred             CCCHHHHH---HHHHHHHHCC-C-CCHHHHHHHHCCCCCCCCCCEEECCCCCHHHHHHHHHCCCEEEECCCCHHHHHHHC
Q ss_conf             43113456---6677764001-2-21144554420245877886651247765899999847978988279989997502
Q gi|254780831|r  237 QDLALIDV---KRAISMYQKM-N-IPIIGMIENMSYFLASDTGKKYDLFGNGGARFEAEKIGIPFLESVPFDMDVRVLSD  311 (341)
Q Consensus       237 ~~~s~~da---~r~~~~~~~~-~-~~i~GiV~NMs~~~~~~~~~~~~~fg~~~~~~~a~~~~i~~lg~IP~d~~i~~a~~  311 (341)
T Consensus       183 E~MalyAANNI~~~i~~~a~~gg~vrl~GlI~N~-------~~------~~~e~e~fa~~~g~~~l~~vP~d~~iRr~~~  249 (329)
T cd02033         183 DLQSLYVANNVCNAVEYFRKLGGNVGVAGMVINK-------DD------GTGEAQAFAAHAGIPILAAIPADEELRRKSA  249 (329)
T ss_pred             CHHHHHHHHHHHHHHHHHHHCCCCCCEEEEEEEC-------CC------CCHHHHHHHHHCCCCEEEECCCCHHHHHHHH
T ss_conf             0889998878999999998638971011598606-------88------7249999999719957996378778876543


Q ss_pred             CCCCEEEECCCCHHHHHHHHHHHHHHHH
Q ss_conf             8821799779998999999999999998
Q gi|254780831|r  312 LGIPIVVHNMNSATSEIYQEISDRIQQF  339 (341)
Q Consensus       312 ~g~P~v~~~p~s~~a~~~~~iA~~i~~~  339 (341)
T Consensus       250 ~y~i--v~~p~~~~~~~f~~LA~~i~~~  275 (329)
T cd02033         250 AYQI--VGRPGTTWGPLFEQLATNVAEA  275 (329)
T ss_pred             HCCC--CCCCCCHHHHHHHHHHHHHHHC
T ss_conf             0260--3487615899999999976127