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Double mutant P96S/S120G of Nm23-H1 abrogates its NDPK activity and motility-suppressive ability

Qinghua Zhou1, Xueqin Yang, Daxing Zhu

  • 1Tianjin Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin 300052, PR China. zhough1016@yahoo.com.cn

Biochemical and Biophysical Research Communications
|March 6, 2007
PubMed

Insights

The Nm23-H1 gene suppresses cancer metastasis through mechanisms beyond kinase activity. Structural changes in Nm23-H1 mutants impair both motility suppression and NDPK activity, suggesting a broader functional role.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Cancer Research

Background:

  • The Nm23-H1 gene acts as a metastasis suppressor, but its precise biochemical mechanism remains unclear.
  • Previous hypotheses linking Nm23-H1's motility-suppressive effect to histidine protein kinase activity were challenged by kinase-deficient mutants retaining this ability.

Purpose of the Study:

  • To investigate the biochemical mechanism of Nm23-H1's metastasis suppression.
  • To analyze the function of Nm23-H1 mutants, specifically the double mutant P96S/S120G, and its impact on NDPK activity and motility suppression.

Main Methods:

  • RP-HPLC method was optimized and applied for Nucleotide Diphosphate Kinase (NDPK) assay.
  • Expression and analysis of the Nm23-H1 double mutant P96S/S120G in bacterial systems.

Main Results:

  • The Nm23-H1 double mutant P96S/S120G aggregated in inclusion bodies when expressed in bacteria.
  • This double mutant exhibited abrogated motility-suppressive ability and lost its NDPK activity.
  • Other mutants (S120G, P96S) also showed deficiencies in motility suppression.

Conclusions:

  • The motility-suppressive function of Nm23-H1 mutants (S120G, P96S, P96S/S120G) is linked to structural alterations.
  • These structural changes likely disrupt multiple Nm23-H1 activities, including NDPK activity and protein interactions, rather than solely kinase activity.

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