Crystal structure of the SepCysS-SepCysE complex from Methanocaldococcus jannaschii

(2S)-2-amino-6-[[3-hydroxy-2-methyl-5-(phosphonooxymethyl)pyridin-4-yl]methylideneamino]hexanoic acid

Ancient translation factor is essential for tRNA-dependent cysteine biosynthesis in methanogenic archaea.

O-phospho-L-seryl-tRNA:Cys-tRNA synthase

MGSSHHHHHHSSGLVPRGSHMELEGPYSKKFEVITLDINLDKYKNLTRSLTREFINLNPIQRGGILPKEAKKAVYEYWDG
YSVCDYCHGRLDEVTCPPIKDFLEDIAKFLNMDCARPTHGAREGKFIVMHAICKEGDYVVLDKNAHYTSYVAAERAKLNV
AEVGYEEEYPTYKINLEGYKEVIDNLEDKGKNVGLILLTHVDGEYGNLNDAKKVGKIAKEKGIPFLLNCAYTVGRMPVNG
KEVKADFIVASGH(LLP)SMAASAPCGILAFSEEFSDKITKTSEKFPVKEIEMLGCTSRGLPIVTLMASFPHVVERVKKW
DEELKKTRYVVDELEKIGFKQLGIKPKEHDLIKFETPVLDEIAKKDKRRGFFFYDELKKRGIGGIRAGVTKEIKMSVYGL
EWEQVEYVVNAIKEIVESCK

MGSSHHHHHHSSGLVPRGSHMELEGPYSKKFEVITLDINLDKYKNLTRSLTREFINLNPIQRGGILPKEAKKAVYEYWDG
YSVCDYCHGRLDEVTCPPIKDFLEDIAKFLNMDCARPTHGAREGKFIVMHAICKEGDYVVLDKNAHYTSYVAAERAKLNV
AEVGYEEEYPTYKINLEGYKEVIDNLEDKGKNVGLILLTHVDGEYGNLNDAKKVGKIAKEKGIPFLLNCAYTVGRMPVNG
KEVKADFIVASGHKSMAASAPCGILAFSEEFSDKITKTSEKFPVKEIEMLGCTSRGLPIVTLMASFPHVVERVKKWDEEL
KKTRYVVDELEKIGFKQLGIKPKEHDLIKFETPVLDEIAKKDKRRGFFFYDELKKRGIGGIRAGVTKEIKMSVYGLEWEQ
VEYVVNAIKEIVESCK

MNHMRVEYSKDLIRKGISTISQLKKAKIRVEKDDKKISYKDAKPGKIDVNEFKKAIYLLIEADDFLYKKAPKHELNEEEA
KEFCKLIIKCQEHLNKILANFGFEFEEKEIDEGALYIVSNKKLFKKLKNKNPNLKVVCTEGMLDIEDMRAIGVPEKALEG
LKKKVEIARKNVERFIEKYKPEKIFVVVEDDKDELLYLRAKNLYNAEKLDADEILD

Ammonium citrate, PEG3350, pH 6.8, VAPOR DIFFUSION, HANGING DROP, temperature 293K

DKYKNLTRSLTREFINLNPIQRGGILPKEAKKAVYEYWDGYSVCDYCHGRLDEVTCPPIKDFLEDIAKFLNMDCARPTHG
AREGKFIVMHAICKEGDYVVLDKNAHYTSYVAAERAKLNVAEVGYEEEYPTYKINLEGYKEVIDNLEDKGKNVGLILLTH
VDGEYGNLNDAKKVGKIAKEKGIPFLLNCAYTVGRMPVNGKEVKADFIVASGHKSMAASAPCGILAFSEEFSDKITKTSE
KFPVKEIEMLGCTSRGLPIVTLMASFPHVVERVKKWDEELKKTRYVVDELEKIGFKQLGIKPKEHDLIKFETPVLDEIAK
KDKRRGFFFYDELKKRGIGGIRAGVTKEIKMSVYGLEWEQVEYVVNAIKEIVESCK

MRVEYSKDLIRKGISTISQLKKAKIRVEKDDKKISYKDAKPGKIDVNEFKKAIYLLIEADDFLYKKAPKHELNEEEAKEF
CKLIIKCQEHLNKILANFGFEFEEKEIDEGALYIVSNKKLFKKLKNKNPNLKVVCTEGMLDIEDMRAIGVPEKALEGLKK
KVEIARKNVERFIEKYKPEKIFVVVEDDKDELLYLRAKNLYNAEKLDADEILD