1SDL
CROSS-LINKED, CARBONMONOXY HEMOGLOBIN A
Summary for 1SDL
Entry DOI | 10.2210/pdb1sdl/pdb |
Descriptor | HEMOGLOBIN A, PROTOPORPHYRIN IX CONTAINING FE, CARBON MONOXIDE, ... (6 entities in total) |
Functional Keywords | heme, oxygen transport, respiratory protein, erythrocyte, disease mutation, polymorphism, acetylation |
Biological source | Homo sapiens (human) More |
Total number of polymer chains | 4 |
Total formula weight | 64869.23 |
Authors | Schumacher, M.A.,Dixon, M.M.,Kluger, R.,Jones, R.T.,Brennan, R.G. (deposition date: 1996-02-26, release date: 1996-08-01, Last modification date: 2024-06-05) |
Primary citation | Schumacher, M.A.,Dixon, M.M.,Kluger, R.,Jones, R.T.,Brennan, R.G. Allosteric transition intermediates modelled by crosslinked haemoglobins. Nature, 375:84-87, 1995 Cited by PubMed Abstract: The structural end-points of haemoglobin's transition from its low-oxygen-affinity (T) to high-oxygen-affinity (R) state, have been well established by X-ray crystallography, but short-lived intermediates have proved less amenable to X-ray studies. Here we use chemical crosslinking to fix these intermediates for structural characterization. We describe the X-ray structures of three haemoglobins, alpha 2 beta 1S82 beta, alpha 2 beta 1Tm82 beta and alpha 2 beta 1,82Tm82 beta, which were crosslinked between the amino groups of residues beta Val1 and beta Lys82 by 3,3'-stilbenedicarboxylic acid (S) or trimesic acid (Tm) while in the deoxy state, and saturated with carbon monoxide before crystallization. alpha 2 beta 1S82 beta, which has almost normal oxygen affinity, is completely in the R-state conformation; however, alpha 2 beta 1Tm82 beta and alpha 2 beta 1,82Tm82 beta, both of which have low oxygen affinity, have been prevented from completing their transition into the R state and display many features of a transitional intermediate. These haemoglobins therefore represent a snapshot of the nascent R state. PubMed: 7723849DOI: 10.1038/375084a0 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (1.8 Å) |
Structure validation
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