Structure of Insect Metalloproteinase Inhibitor in Complex with Thermolysin
Structural evidence for standard-mechanism inhibition in metallopeptidases from a complex poised to resynthesize a Peptide bond.
Inducible metalloproteinase inhibitor protein
ITGTSTVGVGRGVLGDQKNINTTYSTYYYLQDNTRGNGIFTYDAKYRTTLPGSLWADADNQFFASYDAPAVDAHYYAGVT YDYYKNVHNRLSYDGNNAAIRSSVHYSQGYNNAFWNGSQMVYGDGDGQTFIPLSGGIDVVAHELTHAVTDYTAGLIYQNE SGAINEAISDIFGTLVEFYANKNPDWEIGEDVYTPGISGDSLRSMSDPAKYGDPDHYSKRYTGTQDNGGVHINSGIINKA AYLISQGGTHYGVSVVGIGRDKLGKIFYRALTQYLTPTSNFSQLRAAAVQSATDLYGSTSQEVASVKQAFDAVGVK
20% w/v PEG 4000, 0.2 M sodium acetate, 0.1 M Tris-HCl, pH 8.5, VAPOR DIFFUSION, SITTING DROP, temperature 293K
HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
Author states that inhibitor IMPI alpha maintains its 3D structure (represented by chains C,I and D,J) after being cleaved between residues 56-57. The biological assemnbly is a dimeric complex between a proteinase moiety (chains A or B) and an inhibitor moiety (chains C,I or D,J) indicated as trimeric in remark 350.
Thermolysin fold - Family I8 fold, Metalloprotease Thermolysin inhibitor, Zn Binding, Secreted, HYDROLASE-HYDROLASE INHIBITOR complex