3eq1 is a 2 chain structure with sequence from Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
HEM3_HUMAN Defects in HMBS are the cause of acute intermittent porphyria (AIP) [MIM:176000. AIP is a form of porphyria. Porphyrias are inherited defects in the biosynthesis of heme, resulting in the accumulation and increased excretion of porphyrins or porphyrin precursors. They are classified as erythropoietic or hepatic, depending on whether the enzyme deficiency occurs in red blood cells or in the liver. AIP is an autosomal dominant form of hepatic porphyria characterized by acute attacks of neurological dysfunctions with abdominal pain, hypertension, tachycardia, and peripheral neuropathy. Most attacks are precipitated by drugs, alcohol, caloric deprivation, infections, or endocrine factors.[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] [:][28][29][30][31][32][33]
Function
HEM3_HUMAN Tetrapolymerization of the monopyrrole PBG into the hydroxymethylbilane pre-uroporphyrinogen in several discrete steps.
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
Mutations in the human PBGD (porphobilinogen deaminase) gene cause the inherited defect AIP (acute intermittent porphyria). In the present study we report the structure of the human uPBGD (ubiquitous PBGD) mutant, R167Q, that has been determined by X-ray crystallography and refined to 2.8 A (1 A=0.1 nm) resolution (Rfactor=0.26, Rfree=0.29). The protein crystallized in space group P2(1)2(1)2 with two molecules in the asymmetric unit (a=81.0 A, b=104.4 A and c=109.7 A). Phases were obtained by molecular replacement using the Escherichia coli PBGD structure as a search model. The human enzyme is composed of three domains each of approx. 110 amino acids and possesses a dipyrromethane cofactor at the active site, which is located between domains 1 and 2. An ordered sulfate ion is hydrogen-bonded to Arg26 and Ser28 at the proposed substrate-binding site in domain 1. An insert of 29 amino acid residues, present only in mammalian PBGD enzymes, has been modelled into domain 3 where it extends helix alpha2(3) and forms a beta-hairpin structure that contributes to a continuous hydrogen-bonding network spanning domains 1 and 3. The structural and functional implications of the R167Q mutation and other mutations that result in AIP are discussed.
Structure of human porphobilinogen deaminase at 2.8 A: the molecular basis of acute intermittent porphyria.,Gill R, Kolstoe SE, Mohammed F, Al D-Bass A, Mosely JE, Sarwar M, Cooper JB, Wood SP, Shoolingin-Jordan PM Biochem J. 2009 Apr 28;420(1):17-25. PMID:19207107[34]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
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↑Gill R, Kolstoe SE, Mohammed F, Al D-Bass A, Mosely JE, Sarwar M, Cooper JB, Wood SP, Shoolingin-Jordan PM. Structure of human porphobilinogen deaminase at 2.8 A: the molecular basis of acute intermittent porphyria. Biochem J. 2009 Apr 28;420(1):17-25. PMID:19207107 doi:10.1042/BJ20082077
