Protein
Light-independent protochlorophyllide reductase subunit B
Organism
Prochlorococcus marinus subsp. pastoris (strain CCMP1986 / NIES-2087 / MED4)
Function
Component of the dark-operative protochlorophyllide reductase (DPOR) that uses Mg-ATP and reduced ferredoxin to reduce ring D of protochlorophyllide (Pchlide) to form chlorophyllide a (Chlide). This reaction is light-independent. The NB-protein (ChlN-ChlB) is the catalytic component of the complex.
Similarity
Belongs to the ChlB/BchB/BchZ family.
Sequence
MELTLWTYEGPPHVGAMRVASSMKDIHYVLHAPQGDTYADLLFTMIERRGQRPPVTYTTFQARDLGGDTAELVKRNITEAVERFKPKTLLVGESCTAELIQDQPGALAKGMGFDIPIVNLELPAYSKKENWGASETFYQIIRTLLKDKANEIDKINPQRWKSLGRRPKVNILGPTLLGFRCRDDVIEIQRILSEQGIDTNVVAPLGSSPDDITRLTDADINICLYHEIAETSCEWLKRNCGMEYTTTIPIGIKNTINFINEVHEKLDLPLTNQKELEHKSKLPWYSKSVDSNYLTGKRVFVFGDGTHAIAAAKIAKDELGFEVVGLGTYSREMARQVRAAAKELNIEALITNSYLEVEDAMKKASPELVLGTQMERHSAKRLGIPCSVISTPMHVQDVPARYSPQMGWEGANVIFDDWVHPLMMGLEEHLIDMFKHDFEFVDGHQSHLGHTATKGLDNKVDEHAQSNINVQKKGNIIWTDSGRAELTKVPFFVRGKVKSNTEKYALSKGLPEINDETLYDAKAYFG