Tissue transglutaminase catalyzes the deamidation of glutamines in lens βB2- and βB3-crystallins

Sandor Boros, Phillip Wilmarth, Bram Kamps, Wilfried W. de Jong, Hans Bloemendal, Kirsten Lampi, Wilbert C. Boelens

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Tissue transglutaminase (tTG) is a Ca2+-dependent enzyme catalyzing the formation of covalent crosslinks between peptide-bound glutamine and lysine residues. Lens crystallins, including αB-crystallin and several β-crystallins, are in vitro substrates for tTG. In both human and bovine fetal lens extracts treated with commercially available guinea pig liver tTG we detected the formation of high molecular weight (HMW) aggregates containing crosslinked βB2- and βA3-crystallin. More interestingly, 2D-gel electrophoresis combined with mass spectrometry analysis revealed that glutamines present in the N-terminal arms of βB2- and βB3-crystallins deamidate readily in the presence of tTG. We found that both tTG-catalyzed crosslinking and deamidation disrupt the β-crystallin complex, suggesting that these tTG-catalyzed modifications can influence the macromolecular assembly of lens crystallins. These data together suggest that tTG can contribute to the age-related deamidation of glutamine residues of lens crystallins.

Original languageEnglish (US)
Pages (from-to)383-393
Number of pages11
JournalExperimental Eye Research
Volume86
Issue number2
DOIs
StatePublished - Feb 2008

Fingerprint

Crystallins
Glutamine
Lenses
transglutaminase 2
Electrophoresis, Gel, Two-Dimensional
Lysine
Mass Spectrometry
Guinea Pigs
Molecular Weight
Peptides
Liver
Enzymes

Keywords

  • calcium
  • crosslink
  • crystallin
  • deamidation
  • lens
  • transglutaminase

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

Cite this

Tissue transglutaminase catalyzes the deamidation of glutamines in lens βB2- and βB3-crystallins. / Boros, Sandor; Wilmarth, Phillip; Kamps, Bram; de Jong, Wilfried W.; Bloemendal, Hans; Lampi, Kirsten; Boelens, Wilbert C.

In: Experimental Eye Research, Vol. 86, No. 2, 02.2008, p. 383-393.

Research output: Contribution to journalArticle

Boros, Sandor ; Wilmarth, Phillip ; Kamps, Bram ; de Jong, Wilfried W. ; Bloemendal, Hans ; Lampi, Kirsten ; Boelens, Wilbert C. / Tissue transglutaminase catalyzes the deamidation of glutamines in lens βB2- and βB3-crystallins. In: Experimental Eye Research. 2008 ; Vol. 86, No. 2. pp. 383-393.
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AU - Bloemendal, Hans

AU - Lampi, Kirsten

AU - Boelens, Wilbert C.

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AB - Tissue transglutaminase (tTG) is a Ca2+-dependent enzyme catalyzing the formation of covalent crosslinks between peptide-bound glutamine and lysine residues. Lens crystallins, including αB-crystallin and several β-crystallins, are in vitro substrates for tTG. In both human and bovine fetal lens extracts treated with commercially available guinea pig liver tTG we detected the formation of high molecular weight (HMW) aggregates containing crosslinked βB2- and βA3-crystallin. More interestingly, 2D-gel electrophoresis combined with mass spectrometry analysis revealed that glutamines present in the N-terminal arms of βB2- and βB3-crystallins deamidate readily in the presence of tTG. We found that both tTG-catalyzed crosslinking and deamidation disrupt the β-crystallin complex, suggesting that these tTG-catalyzed modifications can influence the macromolecular assembly of lens crystallins. These data together suggest that tTG can contribute to the age-related deamidation of glutamine residues of lens crystallins.

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