PMID:8163020

Citation	Rahfeld, JU, Schierhorn, A, Mann, K and Fischer, G (1994) A novel peptidyl-prolyl cis/trans isomerase from Escherichia coli. FEBS Lett. 343:65-9
Abstract	A novel peptidyl-prolyl cis/trans isomerase was isolated from Escherichia coli cell extract and characterized partially. Determination of the molecular mass by electrospray mass spectrometry indicated a protein of 10102 +/- 2 Da, smaller than cyclophilins or FK 506 binding proteins currently known. The specificity constant kcat/Km determined with Succinyl-Ala-Xaa-Pro-Phe-4-nitroanilide (Xaa = Leu) had a value comparable to those from cyclophilins from the same organism. However, the pattern of subsite specificity (Xaa = Gly, Ala, Val, Ile, Leu, Phe, Trp, His, Lys and Glu) was reminiscent of FK506 binding peptidyl-prolyl cis/trans isomerases. The enzyme activity was not inhibited by cyclosporin A or FK506 at inhibitor concentrations of < 5 microM, concentrations that affect most bacterial peptidyl-prolyl cis/trans isomerases. Computer-assisted analysis of 21 amino acid residues of the N-terminus determined by Edman degradation revealed no homology to known peptidyl-prolyl cis/trans isomerases.
Links	PubMed
Keywords	Amino Acid Isomerases/isolation & purification; Amino Acid Isomerases/metabolism; Amino Acid Sequence; Carrier Proteins/isolation & purification; Carrier Proteins/metabolism; Chromatography, Gel; Electrophoresis, Polyacrylamide Gel; Escherichia coli/enzymology; Humans; Mass Spectrometry; Molecular Sequence Data; Peptidylprolyl Isomerase; Sequence Homology, Amino Acid; Substrate Specificity
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