HHsearch alignment for GI: 254780806 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=99.94  E-value=5.6e-26  Score=171.15  Aligned_cols=237  Identities=20%  Similarity=0.227  Sum_probs=169.8

Q ss_pred             CCCCCEEEEEECCCCCCCHHHHHHHHHHHHHHCCCCEEEEECCCCCCCCHHHCCCCCCCCCCEEEEEECC------CCHH
Q ss_conf             8768749999808898888999999999999879959999878776801121246333454116763025------7712
Q gi|254780806|r    2 EEKKSRIITIANQKGGVGKTTTAINLSTALAAIGENVLLIDLDPQGNASTGLGIELYDRKYSSYDLLIEE------KNIN   75 (265)
Q Consensus         2 ~~~~~kvI~v~s~KGGvGKTT~a~nlA~~la~~g~rVllID~D~q~~~~~~l~~~~~~~~~ti~~~l~~~------~~l~   75 (265)
T Consensus        27 ~~k~~~~IAiY-GKGGIGKSTts~NlsAAlA~~GkkVm~IGCDPKaDSTrlLlg--G~~~~TVLd~~~~~~~~~e~v~~~  103 (329)
T cd02033          27 PTKKTQIIAIY-GKGGIGKSFTLANLSYMMAQQGKRVLLIGCDPKSDTTSLLFG--GKACPTIIETSAKKKLAGEEVQIG  103 (329)
T ss_pred             CCCCCEEEEEE-CCCCCCHHHHHHHHHHHHHHCCCEEEEECCCCCCCHHHHCCC--CCCCCHHHHHHHHCCCCCCCCCHH
T ss_conf             75445499997-688435616889999999977996999788884603341058--988840999998728864434250


Q ss_pred             HCCCCCCCCCEEECCCCCCCCCCCCCCCCCCCCCHHHHHHHHHHHHCCCCCCEEEECCCCCCCCCCHHHH------HHHC
Q ss_conf             1024444442000148874577500012322221023332247651027820331013332222101123------3100
Q gi|254780806|r   76 QILIQTAIPNLSIIPSTMDLLGIEMILGGEKDRLFRLDKALSVQLTSDFSYIFLDCPPSFNLLTMNAMAA------ADSI  149 (265)
Q Consensus        76 ~~i~~~~~~~l~iipa~~~~~~~~~~l~~~~~~~~~l~~~l~~~l~~~yD~IiiD~pp~~~~~~~~al~a------ad~v  149 (265)
T Consensus       104 dv~~~g--~Gv~CvEsGGPEPGvGCAGRGIItai~lLe~-lg-~~~~d~D~V~yDV---LGDVVCGGFAmPiR~g~A~ev  176 (329)
T cd02033         104 DVCFKR--DGVFAMELGGPEVGRGCGGRGIIHGFELLEK-LG-FHDWDFDYVLLDF---LGDVVCGGFGLPIARDMAQKV  176 (329)
T ss_pred             HEEECC--CCEEEEECCCCCCCCCCCCCCHHHHHHHHHH-CC-CCCCCCCEEEEEC---CCCEEECCCCCCCCCCCCCEE
T ss_conf             178625--9988986679999876788730136678776-37-7525899999922---453566463353356876289


Q ss_pred             CCCCCCCCHHHHHHHHHHHHHHHHHHHHHCCCCCCCCCCCEEECCCHHHHHHHHHHHHHHCCCCCCCCCCCCHHHHHHHH
Q ss_conf             11111231137888753357776554320267743100202312531001126899988085201562678688987773
Q gi|254780806|r  150 LVPLQCEFFALEGLSQLLETVEEVRRTVNSALDIQGIILTMFDSRNSLSQQVVSDVRKNLGGKVYNTVIPRNVRISEAPS  229 (265)
Q Consensus       150 iip~~p~~~s~~~~~~~~~~i~~~~~~~~~~~~~~~iv~N~~~~~~~~~~~~~~~l~~~~~~~v~~~~Ip~~~~i~~a~~  229 (265)
T Consensus       177 yIVtSgE~MalyAANNI~~~i~~~a~~gg-~vrl~GlI~N~~~~~----~e-~e~fa~~~g~~~l~-~vP~d~~iRr~~~  249 (329)
T cd02033         177 IVVGSNDLQSLYVANNVCNAVEYFRKLGG-NVGVAGMVINKDDGT----GE-AQAFAAHAGIPILA-AIPADEELRRKSA  249 (329)
T ss_pred             EEEECCCHHHHHHHHHHHHHHHHHHHCCC-CCCEEEEEEECCCCC----HH-HHHHHHHCCCCEEE-ECCCCHHHHHHHH
T ss_conf             99967808899988789999999986389-710115986068872----49-99999971995799-6378778876543


Q ss_pred             CCCCEEEECCCCHHHHHHHHHHHHHHHH
Q ss_conf             7985799979998999999999999999
Q gi|254780806|r  230 YGKPAIIYDLKCAGSQAYLKLASELIQQ  257 (265)
Q Consensus       230 ~g~pv~~~~p~s~~a~~~~~la~el~~~  257 (265)
T Consensus       250 ~y~iv--~~p~~~~~~~f~~LA~~i~~~  275 (329)
T cd02033         250 AYQIV--GRPGTTWGPLFEQLATNVAEA  275 (329)
T ss_pred             HCCCC--CCCCCHHHHHHHHHHHHHHHC
T ss_conf             02603--487615899999999976127