HHsearch alignment for GI: 254780200 and conserved domain: TIGR00109

>TIGR00109 hemH ferrochelatase; InterPro: IPR001015 Synonym(s): Protoheme ferro-lyase, Iron chelatase, etc. Ferrochelatase catalyzes the last step in heme biosynthesis: the chelation of a ferrous ion to proto-porphyrin IX, to form protoheme , . In eukaryotic cells, it binds to the mitochondrial inner membrane with its active site on the matrix side of the membrane. The X-ray structure of Bacillus subtilis and human ferrochelatase have been solved , . The human enzyme exists as a homodimer. Each subunit contains one [Fe2S2] cluster. The monomer is folded into two similar domains, each with a four-stranded parallel beta-sheet flanked by an alpha-helix in a beta-alpha-beta motif that is reminiscent of the fold found in the periplasmic binding proteins. The topological similarity between the domains suggests that they have arisen from a gene duplication event. However, significant differences exist between the two domains, including an N-terminal section (residues 80-130) that forms part of the active site pocket, and a C-terminal extension (residues 390-423) that is involved in coordination of the [Fe2S2]cluster and in stabilisation of the homodimer. The [Fe2S2] cluster ligands are Cys196, Cys403, Cys406 and Cys411. The experiments with Co(II) binding show that His230 and Asp383 are part of the enzyme active site . Ferrochelatase seems to have a structurally conserved core region that is common to the enzyme from bacteria, plants and mammals. Porphyrin binds in the identified cleft; this cleft also includes the metal-binding site of the enzyme. It is likely that the structure of the cleft region will have different conformations upon substrate binding and release .; GO: 0004325 ferrochelatase activity, 0006783 heme biosynthetic process.
Probab=97.13  E-value=0.01  Score=39.60  Aligned_cols=160  Identities=21%  Similarity=0.237  Sum_probs=103.2

Q ss_pred             HHHHHHHHHHHHCCCCCCCCCCCCCCCCH---HHHHHHH-HHHHHHHHCCCCCCEEEEEECCCCHHHHHHCCCCHHHHHH
Q ss_conf             99999999987179986421334557800---6899999-9999997338998669998336750267627998889999
Q gi|254780200|r  157 AQDKVFQELIHMRWSPSLRTVPPYYEDSD---YISALAQ-SIREHFESIQWTPEMLLVSFHQMPVSYLLKGDPYGCHCHK  232 (343)
Q Consensus       157 ~~~~~~~~l~~~~~~~~~~~I~~~~~~p~---yI~a~~~-~I~~~l~~~~~~~~~llfSaHglP~~~~~~gDpY~~q~~~  232 (343)
T Consensus        20 ~~e~v~~fL~~~f~Dp~~~~~~~~~~~K~~~~~I~~lR~~k~~K~Y~~iG-----------------~EGgSPL~~it~~   82 (339)
T TIGR00109        20 KLEEVERFLKQLFADPRIIDISRAKWRKLLAKMILPLRSKKIAKNYEEIG-----------------TEGGSPLLQITEQ   82 (339)
T ss_pred             CHHHHHHHHHHHCCCCCEECCCCHHCCCCHHHHHHHHHHHHHHHHHHHHC-----------------CCCCCHHHHHHHH
T ss_conf             51226899997517830011651200642899976521088999999727-----------------7788714689999


Q ss_pred             HHHHHHHHHC--CCCCCCEEEEECCCCCCCCCCHHHHHHHHHHHHCCCCCEEEEC--CHHHHCCHHHHHHHHHHHHHHHH
Q ss_conf             9999999726--6756704786225777654430268999989976998399974--40542212558887589999999
Q gi|254780200|r  233 TARLLKEFLS--WPDDRFKICFQSRFGRIKCLEPPTDKTVEKLAHDGIKSLAIIT--PGFSSDCLETSYEIAHEAKEIFV  308 (343)
Q Consensus       233 t~~~i~~~l~--~~~~~~~l~fQSr~Gp~~WL~P~t~~~l~~L~~~G~k~v~v~p--~gFvsD~lETl~Eidie~~e~~~  308 (343)
T Consensus        83 Q~~~L~~~L~~~~~~---~~~~~~~~a-m~Y~~P~~~~av~~l~~d~v~~~V~l~lYPhfS~sTtgS~--f~-~l~~~~~  155 (339)
T TIGR00109        83 QAEALEKRLDKEIQE---EIDAKVYIA-MRYGEPFTEEAVKELLKDGVERLVVLPLYPHFSSSTTGSS--FN-ELAEALK  155 (339)
T ss_pred             HHHHHHHHCCCCCCC---CCCCCEEEE-EECCCCHHHHHHHHHHHCCCCEEEEEECCCCCCCHHHHHH--HH-HHHHHHH
T ss_conf             999998624422435---687330453-2127821899999986454648888514873000127889--99-9999998


Q ss_pred             HCCCC---EEEEECCCCCCHHHHHHHHHHHHHHHC
Q ss_conf             75997---589816898798999999999999842
Q gi|254780200|r  309 NGGGE---KFTQVPCLNSSNLSIDLLEKITRRELM  340 (343)
Q Consensus       309 e~Gg~---~~~rvp~lN~~~~fi~~La~lv~~~l~  340 (343)
T Consensus       156 ~~~slR~~~~~~I~~w~~~~~y~~a~~d~i~~~l~  190 (339)
T TIGR00109       156 KLRSLRSLKISVIESWYDNEKYIKALADSIKETLK  190 (339)
T ss_pred             HCCCCCCCCEEEEECCCCCHHHHHHHHHHHHHHHH
T ss_conf             34896576314751445688799999999999984