5XF7

Crystal structure of human protein disulfide isomerase-like protein of the testis

Summary for 5XF7

• Entry DOI: 10.2210/pdb5xf7/pdb
• Descriptor: Protein disulfide-isomerase-like protein of the testis (2 entities in total)
• Functional Keywords: chaperone
• Biological source: Homo sapiens (Human)
• Cellular location: Endoplasmic reticulum : Q8N807
• Total number of polymer chains: 1
• Total formula weight: 66344.34

Authors

Li, H.,Li, J.,Liu, Y.,Liang, H. (deposition date: 2017-04-08, release date: 2017-12-13, Last modification date: 2023-11-22)

Primary citation

Li, H.,Yang, K.,Wang, W.,Niu, Y.,Li, J.,Dong, Y.,Liu, Y.,Wang, C.C.,Wang, L.,Liang, H.
Crystal and solution structures of human protein-disulfide isomerase-like protein of the testis (PDILT) provide insight into its chaperone activity
J. Biol. Chem., 293:1192-1202, 2018

PubMed Abstract: Protein-disulfide isomerase-like protein of the testis (PDILT), a member of the protein-disulfide isomerase family, is a chaperone essential for the folding of spermatogenesis-specific proteins in male postmeiotic germ cells. However, the structural mechanisms that regulate the chaperone function of PDILTs are unknown. Here, we report the structures of human PDILT (hPDILT) determined by X-ray crystallography to 2.4 Å resolution and small-angle X-ray scattering (SAXS). Distinct from previously reported U-like structures of related PDI family proteins, our structures revealed that hPDILT folds into a compact L-like structure in crystals and into an extended chain-like structure in solution. The hydrophobic regions and the hydrophobic pockets in hPDILT, which are important for substrate recognition, were clearly delineated in the crystal structure. Moreover, our results of the SAXS analysis and of structure-based substitutions and truncations indicated that the C-terminal tail in hPDILT is required for suppression of aggregation of denatured proteins, suggesting that the tail is crucial for the chaperone activity of PDILT. Taken together, our findings have identified the critical regions and conformational changes of PDILT that enable and control its activity. These results advance our understanding of the structural mechanisms involved in the chaperone activity of PDILT.

PubMed: 29203529
DOI: 10.1074/jbc.M117.797290

Experimental method

X-RAY DIFFRACTION (2.381 Å)