European Biophysics Journal

, Volume 48, Issue 4, pp 341–348 | Cite as

Equilibrium partially folded states of B. licheniformis\(\beta \)-lactamase

  • Valeria A. Risso
  • Mario R. ErmácoraEmail author
Original Article


\(\beta \)-Lactamases (penicillinases) facilitate bacterial resistance to antibiotics and are excellent theoretical and experimental models in protein structure, dynamics and evolution. Bacillus licheniformis exo-small penicillinase (ESP) is a Class A \(\beta \)-lactamase with three tryptophan residues located one in each of its two domains and one in the interface between domains. The conformational landscape of three well-characterized ESP Trp\(\rightarrow \)Phe mutants was characterized in equilibrium unfolding experiments by measuring tryptophan fluorescence, far-UV CD, activity, hydrodynamic radius, and limited proteolysis. The Trp\(\rightarrow \)Phe substitutions had little impact on the native conformation, but changed the properties of the partially folded states populated at equilibrium. The results were interpreted in the framework of modern theories of protein folding.


\(\beta \)-Lactamase Protein folding Circular dichroism Protein conformation 



This work was supported by grants from CONICET (PIP-GI 11220130100277CO) and the Universidad Nacional de Quilmes (PP 53/1002).

Supplementary material

249_2019_1361_MOESM1_ESM.pdf (1.3 mb)
Supplementary material 1 (pdf 1311 KB)


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Copyright information

© European Biophysical Societies' Association 2019

Authors and Affiliations

  1. 1.Departamento de Ciencia y TecnologíaUniversidad Nacional de QuilmesBernalArgentina
  2. 2.Departamento de Quimica Fisica, Facultad de CienciasUniversity of GranadaGranadaSpain
  3. 3.Instituto Multidisciplinario de Biología CelularConicet-CIC-UNLPLa PlataArgentina

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