5k24

From Proteopedia

Crystal structure of the complex between phosphatase PRL-2 in the oxidized state with the Bateman domain of murine magnesium transporter CNNM3

PDB ID 5k24

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Structural highlights

5k24 is a 4 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 3.1Å
Ligands:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

TP4A2_MOUSE Protein tyrosine phosphatase which stimulates progression from G1 into S phase during mitosis. Inhibits geranylgeranyl transferase type II activity by blocking the association between RABGGTA and RABGGTB (By similarity).

Publication Abstract from PubMed

The phosphatases of regenerating liver (PRLs) are involved in tumorigenesis and metastatic cancer yet their cellular function remains unclear. Recent reports have shown PRL phosphatases bind tightly to the CNNM family of membrane proteins to regulate magnesium efflux. Here, we characterize the interactions between the CBS-pair (Bateman) domain of CNNM3 and either PRL2 or PRL3 using X-ray crystallography, isothermal titration calorimetry, and activity assays. We report four new crystal structures of PRL proteins bound to the CNNM3 CBS-pair domain that reveal the effects of cysteine disulphide formation and nucleotide binding on complex formation. We use comprehensive mutagenesis of the PRL3 catalytic site to quantify the importance of different PRL amino acids, including cysteine 104, leucine 108, and arginine 110, for CNNM binding and phosphatase activity. We show the PRL3 R138E mutant is selectively deficient in CNNM3 binding with the potential to distinguish between the downstream effects of phosphatase and CNNM-binding activities in vivo. Through a novel activity assay, we show that PRL3 has magnesium-sensitive phosphatase activity with ATP and other nucleotides. Our results identify a strong correlation between phosphatase activity and CNNM binding and support the contention that PRL function as pseudophosphatases regulated by chemical modifications of their catalytic cysteine.

PRL3 phosphatase active site is required for binding the putative magnesium transporter CNNM3.,Zhang H, Kozlov G, Li X, Wu H, Gulerez I, Gehring K Sci Rep. 2017 Mar 3;7(1):48. doi: 10.1038/s41598-017-00147-2. PMID:28246390^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Zhang H, Kozlov G, Li X, Wu H, Gulerez I, Gehring K. PRL3 phosphatase active site is required for binding the putative magnesium transporter CNNM3. Sci Rep. 2017 Mar 3;7(1):48. doi: 10.1038/s41598-017-00147-2. PMID:28246390 doi:http://dx.doi.org/10.1038/s41598-017-00147-2