TABLE 4.

Comparison of actin homologs

CharacteristicResulta for:
ActinbTa0583ParMcMreBd
Effect of MgCl2++±
Nucleotide effective for polymerizationATPNTP/dNTPATPATP, GTP
Critical concn (μM)0.250.34ND0.003
Unit size (nm)5.5 by 5.55.5 by 5.54.95.1 by 3.9
Fiber structureHelixHelixHelixStraight
  • a +, enhancement; −, suppression; ±, no effect; ND, no data.

  • b Results in references 7, 12, and 23 were used.

  • c Results in reference 25 were used.

  • d Results in references 7 and 35 were used.