8DU7

Room-temperature serial synchrotron crystallography (SSX) structure of apo PTP1B

Summary for 8DU7

• Entry DOI: 10.2210/pdb8du7/pdb
• Descriptor: Tyrosine-protein phosphatase non-receptor type 1, 2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL (3 entities in total)
• Functional Keywords: protein tyrosine phosphatase, ptp, protein tyrosine phosphatase 1b, hydrolase
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 1
• Total formula weight: 33150.92

Authors

Ebrahim, A.,Sharma, S.,Keedy, D.A. (deposition date: 2022-07-27, release date: 2022-08-17, Last modification date: 2023-10-25)

Primary citation

Sharma, S.,Ebrahim, A.,Keedy, D.A.
Room-temperature serial synchrotron crystallography of the human phosphatase PTP1B.
Acta Crystallogr.,Sect.F, 79:23-30, 2023

PubMed Abstract: Room-temperature X-ray crystallography provides unique insights into protein conformational heterogeneity, but obtaining sufficiently large protein crystals is a common hurdle. Serial synchrotron crystallography (SSX) helps to address this hurdle by allowing the use of many medium- to small-sized crystals. Here, a recently introduced serial sample-support chip system has been used to obtain the first SSX structure of a human phosphatase, specifically protein tyrosine phosphatase 1B (PTP1B) in the unliganded (apo) state. In previous apo room-temperature structures, the active site and allosteric sites adopted alternate conformations, including open and closed conformations of the active-site WPD loop and of a distal allosteric site. By contrast, in our SSX structure the active site is best fitted with a single conformation, but the distal allosteric site is best fitted with alternate conformations. This observation argues for additional nuance in interpreting the nature of allosteric coupling in this protein. Overall, our results illustrate the promise of serial methods for room-temperature crystallography, as well as future avant-garde crystallography experiments, for PTP1B and other proteins.

PubMed: 36598353
DOI: 10.1107/S2053230X22011645

Experimental method

X-RAY DIFFRACTION (2.4 Å)