Crystal structure of a catalytic antibody with a serine protease active site

G. Wayne Zhou, Jincan Guo, Wei Huang, Robert J. Fletterick, Thomas (Tom) Scanlan

Research output: Contribution to journalArticle

185 Citations (Scopus)

Abstract

The three-dimensional structure of an unusually active hydrolytic antibody with a phosphonate transition state analog (hapten) bound to the active site has been solved to 2.5 Å resolution. The antibody (17E8) catalyzes the hydrolysis of norleucine and methionine phenyl esters and is selective for amino acid esters that have the natural α-carbon L configuration. A plot of the pH-dependence of the antibody-catalyzed reaction is bell-shaped with an activity maximum at pH 9.5; experiments on mechanism lend support to the formation of a covalent acyl-antibody intermediate. The structural and kinetic data are complementary and support a hydrolytic mechanism for the antibody that is remarkably similar to that of the serine proteases. The antibody active site contains a Ser-His dyad structure proximal to the phosphorous atom of the bound hapten that resembles two of the three components of the Ser-His-Asp catalytic triad of serine proteases. The antibody active site also contains a Lys residue to stabilize oxyanion formation, and a hydrophobic binding pocket for specific substrate recognition of norleucine and methionine side chains. The structure identifies active site residues that mediate catalysis and suggests specific mutations that may improve the catalytic efficiency of the antibody. This high resolution structure of a catalytic antibody-hapten complex shows that antibodies can converge on active site structures that have arisen through natural enzyme evolution.

Original languageEnglish (US)
Pages (from-to)1059-1064
Number of pages6
JournalScience
Volume265
Issue number5175
StatePublished - Aug 19 1994
Externally publishedYes

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Catalytic Antibodies
Serine Proteases
Catalytic Domain
Antibodies
Haptens
Norleucine
seryl-histidine
Methionine
Esters
Organophosphonates
Catalysis
Hydrolysis
Carbon
Amino Acids

ASJC Scopus subject areas

  • General

Cite this

Zhou, G. W., Guo, J., Huang, W., Fletterick, R. J., & Scanlan, T. T. (1994). Crystal structure of a catalytic antibody with a serine protease active site. Science, 265(5175), 1059-1064.

Crystal structure of a catalytic antibody with a serine protease active site. / Zhou, G. Wayne; Guo, Jincan; Huang, Wei; Fletterick, Robert J.; Scanlan, Thomas (Tom).

In: Science, Vol. 265, No. 5175, 19.08.1994, p. 1059-1064.

Research output: Contribution to journalArticle

Zhou, GW, Guo, J, Huang, W, Fletterick, RJ & Scanlan, TT 1994, 'Crystal structure of a catalytic antibody with a serine protease active site', Science, vol. 265, no. 5175, pp. 1059-1064.
Zhou GW, Guo J, Huang W, Fletterick RJ, Scanlan TT. Crystal structure of a catalytic antibody with a serine protease active site. Science. 1994 Aug 19;265(5175):1059-1064.
Zhou, G. Wayne ; Guo, Jincan ; Huang, Wei ; Fletterick, Robert J. ; Scanlan, Thomas (Tom). / Crystal structure of a catalytic antibody with a serine protease active site. In: Science. 1994 ; Vol. 265, No. 5175. pp. 1059-1064.
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