Structural Basis for the Selective Inhibition of Cdc2-Like Kinases by CX-4945

Joint Authors

Chang, Jeong Ho
Lee, Joo Youn
Yun, Ji-Sook
Kim, Woo-Keun
Chun, Hang-Suk
Jin, Hyeonseok
Cho, Sungchan

Source

BioMed Research International

Issue

Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-10, 10 p.

Publisher

Hindawi Publishing Corporation

Publication Date

2019-08-18

Country of Publication

Egypt

No. of Pages

10

Main Subjects

Medicine

Abstract EN

Cdc2-like kinases (CLKs) play a crucial role in the alternative splicing of eukaryotic pre-mRNAs through the phosphorylation of serine/arginine-rich proteins (SR proteins).

Dysregulation of this processes is linked with various diseases including cancers, neurodegenerative diseases, and many genetic diseases.

Thus, CLKs have been regarded to have a potential as a therapeutic target and significant efforts have been exerted to discover an effective inhibitor.

In particular, the small molecule CX-4945, originally identified as an inhibitor of casein kinase 2 (CK2), was further revealed to have a strong CLK-inhibitory activity.

Four isoforms of CLKs (CLK1, CLK2, CLK3, and CLK4) can be inhibited by CX-4945, with the highest inhibitory effect on CLK2.

This study aimed to elucidate the structural basis of the selective inhibitory effect of CX-4945 on different isoforms of CLKs.

We determined the crystal structures of CLK1, CLK2, and CLK3 in complex with CX-4945 at resolutions of 2.4 Å, 2.8 Å, and 2.6 Å, respectively.

Comparative analysis revealed that CX-4945 was bound in the same active site pocket of the CLKs with similar interacting networks.

Intriguingly, the active sites of CLK/CX-4945 complex structures had different sizes and electrostatic surface charge distributions.

The active site of CLK1 was somewhat narrow and contained a negatively charged patch.

CLK3 had a protruded Lys248 residue in the entrance of the active site pocket.

In addition, Ala319, equivalent to Val324 (CLK1) and Val326 (CLK2), contributed to the weak hydrophobic interactions with the benzonaphthyridine ring of CX-4945.

In contrast, the charge distribution pattern of CLK2 was the weakest, favoring its interactions with benzonaphthyridine ring.

Thus, the relatively strong binding affinities of CX-4945 with CLK2 are consistent with its strong inhibitory effect defined in the previous study.

These results may provide insights into structure-based drug discovery processes.

American Psychological Association (APA)

Lee, Joo Youn& Yun, Ji-Sook& Kim, Woo-Keun& Chun, Hang-Suk& Jin, Hyeonseok& Cho, Sungchan…[et al.]. 2019. Structural Basis for the Selective Inhibition of Cdc2-Like Kinases by CX-4945. BioMed Research International،Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1126481

Modern Language Association (MLA)

Lee, Joo Youn…[et al.]. Structural Basis for the Selective Inhibition of Cdc2-Like Kinases by CX-4945. BioMed Research International No. 2019 (2019), pp.1-10.
https://search.emarefa.net/detail/BIM-1126481

American Medical Association (AMA)

Lee, Joo Youn& Yun, Ji-Sook& Kim, Woo-Keun& Chun, Hang-Suk& Jin, Hyeonseok& Cho, Sungchan…[et al.]. Structural Basis for the Selective Inhibition of Cdc2-Like Kinases by CX-4945. BioMed Research International. 2019. Vol. 2019, no. 2019, pp.1-10.
https://search.emarefa.net/detail/BIM-1126481

Data Type

Journal Articles

Language

English

Notes

Includes bibliographical references

Record ID

BIM-1126481