3viv | pdb_00003viv

1510-N membrane-bound stomatin-specific protease K138A mutant in complex with a substrate peptide

spinqualitylabelsall models 3viv, resolution 2.25Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3viv is a 3 chain structure with sequence from Pyrococcus horikoshii. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL, GOL, IMD Related: 2deo, 3bpp Gene: PH1510 (Pyrococcus horikoshii) Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed Membrane-bound proteases are involved in various regulatory functions. A previous report indicated that the N-terminal region of PH1510p (1510-N) from the hyperthermophilic archaeon Pyrococcus horikoshii is a serine protease with a catalytic Ser-Lys dyad (Ser97 and Lys138) and specifically cleaves the C-terminal hydrophobic region of the p-stomatin PH1511p. In humans, an absence of stomatin is associated with a form of hemolytic anemia known as hereditary stomatocytosis. Here, the crystal structure of 1510-N K138A in complex with a peptide substrate was determined at 2.25 A resolution. In the structure, a 1510-N dimer binds to one peptide. The six central residues (VIVLML) of the peptide are hydrophobic and in a pseudopalindromic structure and therefore favorably fit into the hydrophobic active tunnel of the 1510-N dimer, although 1510-N degrades the substrate at only one point. A comparison with unliganded 1510-N K138A revealed that the binding of the substrate causes a large rotational and translational displacement between protomers and produces a tunnel suitable for binding the peptide. When the peptide binds, the flexible L2 loop of one protomer forms beta-strands, whereas that of the other protomer remains in a loop form, indicating that one protomer binds to the peptide more tightly than the other protomer. The Ala138 residues of the two protomers are located very close together (the distance between the two Cbeta atoms is 3.6 A). Thus, in wild-type 1510-N, the close positioning of the catalytic Ser97 and Lys138 residues may be induced by electrostatic repulsion of the two Lys138 side chains of the protomers. Crystal structure of a membrane stomatin-specific protease in complex with a substrate Peptide.,Yokoyama H, Takizawa N, Kobayashi D, Matsui I, Fujii S Biochemistry. 2012 May 8;51(18):3872-80. Epub 2012 Apr 23. PMID:22475127 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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