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IMG_0004_NEW_0034 - example Gatalase Decomposition of...

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Enzymes Enzymes = biological catalysts Very efficient catalysis under bioloeical conditions Example: Conversion of N, to NH, Humans: Haber process N2+3H2#flb2NH3 Enzymes = proteins Nature : Nitrogenase enzyme Nz+8H*ffi 2NH3+H2 HrO -l* ""-iifrLi-"," a' I d13}l ,l 'o" Peptide i + f xi.i. . j*.i;i. .,!=,iq,it i_s-" Protein : , i Foldingof sfo i-c-c ,'l'* Anino acid clo N-C-C x'Jt* Amino acid F Protein active sirc = sirc ofcafalytic reaction I roldrng ot I protein chain . _ f +3-Dstrucfure $ Enzyme
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Unformatted text preview: example: Gatalase Decomposition of hydrogen peroxide (toxic) 2HrO, -+ 2H2O + 02 Under biological conditions: Very Slow Catalase: 10 million molecules of I{rO, per catalase molecule per second ,d#. +* Gatalase (Mw = 250,000) Active sites Active site (withod protein) (Fe porphyrin) Complex mechanism: HzOz+ Fe(III)-E. .- H2O + O-Fe(IV)_E HzOz+ O:Fe(IV)-E --- H2O + Fe(III)-E + 02 l0 .,'/ -::'-*'1'--'!-*--.' e'--o:ar ,Y\r,. Hff It^ .a...
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