5YB9 image
Entry Detail
PDB ID:
5YB9
Keywords:
Title:
Crystal structure of a dimeric cyclophilin A from T.vaginalis
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2017-09-04
Release Date:
2018-07-18
Method Details:
Experimental Method:
Resolution:
2.28 Å
R-Value Free:
0.28
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 61 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Peptidyl-prolyl cis-trans isomerase
Chain IDs:A
Chain Length:175
Number of Molecules:1
Biological Source:Trichomonas vaginalis
Primary Citation
Structural basis of interaction between dimeric cyclophilin 1 and Myb1 transcription factor in Trichomonas vaginalis
Sci Rep 8 5410 5410 (2018)
PMID: 29615721 DOI: 10.1038/s41598-018-23821-5

Abstact

Cyclophilin 1 (TvCyP1), a cyclophilin type peptidyl-prolyl isomerase present in the human parasite Trichomonas vaginalis, interacts with Myb1 and assists in its nuclear translocation. Myb1 regulates the expression of ap65-1 gene that encodes for a disease causing cytoadherence enzyme. Here, we determined the crystal structures of TvCyP1 and its complex with the minimum TvCyP1-binding sequence of Myb1 (Myb1104-111), where TvCyP1 formed a homodimer, unlike other single domain cyclophilins. In the complex structure, one Myb1104-111 peptide was bound to each TvCyP1 protomer, with G106-P107 and Y105 fitting well into the active site and auxiliary S2 pocket, respectively. NMR data further showed that TvCyP1 can catalyze the cis/trans isomerization of P107 in Myb1104-111. Interestingly, in the well-folded Myb1 protein (Myb135-141), the minimum binding sequence adopted a different conformation from that of unstructured Myb1104-111 peptide, that could make P107 binding to the active site of TvCyP1 difficult. However, NMR studies showed that similar to Myb1104-111 peptide, Myb135-141 also interacted with the active site of TvCyP1 and the dynamics of the Myb135-141 residues near P107 was reduced upon interaction. Together, the structure of TvCyP1 and detailed structural insights on TvCyP1-Myb1 interaction provided here could pave the way for newer drugs to treat drug-resistant strains.

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