A ribosome-associated peptidyl-prolyl cis/trans isomerase identified as the trigger factor

Title data

Stoller, Gerlind ; Rücknagel, K. Peter ; Nierhaus, Knud H. ; Schmid, Franz X. ; Fischer, Gunter ; Rahfeld, Jens-U.:
A ribosome-associated peptidyl-prolyl cis/trans isomerase identified as the trigger factor.
In: The EMBO Journal. Vol. 14 (1995) Issue 20 . - pp. 4939-4948.
ISSN 1460-2075

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Abstract in another language

Peptidyl-prolyl cis/trans isomerases (PPIases) are enzymes that catalyse protein folding both in vitro and in vivo. We isolated a peptidyl-prolyl cis/trans isomerase (PPIase) which is specifically associated with the 50S subunit of the Escherichia coli ribosome. This association was abolished by adding at least 1.5 M LiCl. Sequencing the N-terminal amino acids in addition to three proteolytic fragments totalling 62 amino acids revealed that this PPIase is identical to the E.coli trigger factor. A comparison of the amino acid sequence of trigger factor with those of other PPIase families shows little similarities, suggesting that trigger factor may represent an additional family of PPIases. Trigger factor was purified to homogeneity on a preparative scale from E.coli and its enzymatic properties were studied. In its activity towards oligopeptide substrates, the trigger factor resembles the FK506-binding proteins (FKBPs). Additionally, the pattern of subsite specificities with respect to the amino acid preceding proline in Suc-Ala-Xaa-Pro-Phe-4-nitroanilides is reminiscent of FKBPs. However, the PPIase activity of the trigger factor was not inhibited by either FK506 or by cyclosporin A at concentrations up to 100 microM. In vitro, the trigger factor catalysed the proline-limited refolding of a variant of RNase T1 much better than all other PPIases that have been examined so far.

Further data

Item Type:	Article in a journal
Refereed:	Yes
Additional notes:	PubMed-ID: 2843289
Institutions of the University:	Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Professor Biochemistry - Univ.-Prof. Dr. Franz Xaver Schmid Faculties Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Professorship Biochemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Result of work at the UBT:	No
DDC Subjects:	500 Science > 540 Chemistry
Date Deposited:	18 May 2015 06:36
Last Modified:	28 Feb 2023 13:25
URI:	https://eref.uni-bayreuth.de/id/eprint/13512