mammalian blood serum haemopexin glycosylated-native protein and in complex with its ligand haem

Crystal Structure of Hemopexin Reveals a Novel High-Affinity Heme Site Formed between Two Beta-Propeller Domains.

COVALENT LINK BETWEEN FE OF HAEM LIGAND AND (I) NE2 OF HIS 213 AND (II) NE2 OF HIS 266

MVKASGIPIALGVWGLCWSLATVNSVPLTSAHGNVTEGESGTKPEADVIEQCSDGWSFDATTLDDNGTMLFFKDEFVWKS
HRGIRELISERWKNFIGPVDAAFRHGHTSVYLIKGDKVWVYTSEKNEKVYPKSLQDEFPGIPFPLDAAVECHRGECQDEG
ILFFQGNRKWFWDLTTGTKKERSWPAVGNCTSALRWLGRYYCFQGNQFLRFNPVSGEVPPGYPLDVRDYFLSCPGRGHRS
SHRNSTQHGHESTRCDPDLVLSAMVSDNHGATYVFSGSHYWRLDTNRDGWHSWPIAHQWPQGPSTVDAAFSWEDKLYLIQ
DTKVYVFLTKGGYTLVNGYPKRLEKELGSPPVISLEAVDAAFVCPGSSRLHIMAGRRLWWLDLKSGAQATWTELPWPHEK
VDGALCMEKPLGPNSCSTSGPNLYLIHGPNLYCYRHVDKLNAAKNLPQPQRVSRLLGCTH

HANGING DROP, 4 DEGREES CENTIGRADE. RESEVOIR SOLUTION: 15-22% PEG 6000, 0.1-0.2 M TRIS HCL PH 7.9, 0.05-0.1 M EDTA, 0.05-0.2 NACL, PROTEIN COMPLEX SOLUTION: 65 MG/ML IN 0.01 M TRIS PH 7.9, 0.01 M NACL, 0.1 M EDTA

THIS ENTRY ACCOMPANIES PDB ENTRY 1QHU, WHICH IS FOR DEGLYCOSYLATED HAEMOPEXIN. THE CRYSTALS WERE PREPARED WITH THE WILD TYPE PROTEIN IN ITS NATIVE GLYCOSYLATED STATE.
THE N-TERMINUS (-25 TO 24 IN PDB NUMBERING, 1 TO 48 IN SWS) IS DISORDERED IN THE ELECTRON DENSITY MAPS. THE NUMERING OF RESIDUES IS SUCH THAT IT IS CONSISTENT WITH THE RESIDUE NUMERING IN PDB ENTRY 1HXN FOR THE C-TERMINAL DOMAIN STRUCTURE

ELECTRON DENSITY FOR RESIDUES ARG 214, SER 215, HIS 223 AND C-TERMINAL HIS 435 IS POORLY DEFINED. FOR BOTH CHAINS A AND B RESIDUES 219 - 222 COULD NOT BE FITTED INTO THE ELECTRON DENSITY MAPS AND ARE NOT INCLUDED IN THE MODEL.

TRANSPORT PROTEIN, HAEM BINDING PROTEIN, BETA PROPELLER, HAEM BINDING AND TRANSPORT, IRON METABOLISM