Synthesis of proteins containing modified arginine residues

Ambar K. Choudhury, Serguei Y. Golovine, Larisa Dedkova, Sidney Hecht

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

Unnatural amino acid mutagenesis provides the wherewithal to study protein function in great detail. To extend the repertoire of functionalized amino acids available for study by this technique, seven structural analogues of arginine were prepared and used to activate a suppressor tRNACUA- These included Nγ-methylarginine, Nγ-nitroarginine, citrulline, homoarginine, and three conformationally constrained analogues based on proline. These misacylated tRNAs were shown to be capable of introducing the arginine analogues into dihydrofolate reductase (position 22) and Photinus pyralis luciferase (positions 218 and 437). Most of the modified luciferases containing arginine analogues at position 218 emitted light with less efficiency and at longer wavelength than the wild type. This is consistent with the postulated role of this residue as essential for maintaining the polarity and rigidity of the luciferin-binding site. Interestingly, the luciferase containing Nγ-methylarginine at position 218 emitted light at the same wavelength as the wild type and was at least as efficient. Alteration of the arginine residue at position 437 had no effect on the wavelength of emitted light but afforded analogues, all of which emitted light less efficiently than the wild type. This is altogether consistent with the putative role of Arg437, which is an invariant residue within the superfamily of enzymes that includes P. pyralis luciferase. This amino acid is part of the linker between the two structural domains of luciferase that is believed to be essential for efficient enzyme function but not part of the substrate-binding site.

Original languageEnglish (US)
Pages (from-to)4066-4076
Number of pages11
JournalBiochemistry
Volume46
Issue number13
DOIs
StatePublished - Apr 3 2007
Externally publishedYes

Fingerprint

Luciferases
Arginine
Light
Amino Acids
Wavelength
Proteins
Homoarginine
Binding Sites
Citrulline
Mutagenesis
Tetrahydrofolate Dehydrogenase
Nitroarginine
Enzymes
Transfer RNA
Proline
Rigidity
Substrates

ASJC Scopus subject areas

  • Biochemistry

Cite this

Synthesis of proteins containing modified arginine residues. / Choudhury, Ambar K.; Golovine, Serguei Y.; Dedkova, Larisa; Hecht, Sidney.

In: Biochemistry, Vol. 46, No. 13, 03.04.2007, p. 4066-4076.

Research output: Contribution to journalArticle

Choudhury, Ambar K. ; Golovine, Serguei Y. ; Dedkova, Larisa ; Hecht, Sidney. / Synthesis of proteins containing modified arginine residues. In: Biochemistry. 2007 ; Vol. 46, No. 13. pp. 4066-4076.
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