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Volumn 297, Issue 5590, 2002, Pages 2263-2267

Conversion of Unc104/KIF1A kinesin into a processive motor after dimerization

Author keywords

[No Author keywords available]

Indexed keywords

CELLS; MONOMERS; NEUROLOGY;

EID: 0037183926     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1073386     Document Type: Article
Times cited : (230)

References (24)
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    • A. J. Otsuka et al., Neuron 6, 113 (1991).
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    • Otsuka, A.J.1
  • 9
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    • M. Kikkawa et al., Nature 411, 439 (2001).
    • (2001) Nature , vol.411 , pp. 439
    • Kikkawa, M.1
  • 10
    • 2142791882 scopus 로고    scopus 로고
    • note
    • In our assays, neither the dimeric Uncl04 motors nor the truncated monomers (U362-GFP or U371-GFP) displayed the biased diffusiona[ motion reported by Okada and Hirokawa (6, 7). However, we were able to observe this motion only by adding extra positively charged residues to the neck linker region and under specific buffer condition (see movie S6 legend for details).
  • 14
    • 2142803437 scopus 로고    scopus 로고
    • Materials and methods are available as supporting material on Science Online.
    • Science Online
  • 15
    • 0035903699 scopus 로고    scopus 로고
    • K. R. Rogers et al., EMBO J. 20, 5101 (2001).
    • (2001) EMBO J. , vol.20 , pp. 5101
    • Rogers, K.R.1
  • 16
    • 2142671963 scopus 로고    scopus 로고
    • note
    • To achieve motility velocities of 2 μm/s with an 8-nm step size, one would predict an adenosine triphosphatase catalytic rate constant of -125 adenosine 5′-triphosphate (ATP)/s per head for the constitutive Unc104 dimers. Our measured rates varied depending on the protein preparation but were in the range of 30 to 100 ATP/s per head, suggesting that some portion of the molecules may be inactive. The microtubule concentration for half-maximal ATPase stimulation of U356-Kstalk-GFP (0.078 μM) was two orders of magnitude smaller than that of U653 (5), indicating an increased microtubule affinity.
  • 18
    • 2142719837 scopus 로고    scopus 로고
    • note
    • The 1362E/L365K mutation is predicted to decrease the probability of coiled-coil formation in Unc104's neck coiled-coil from 0.22 to 0.002 (using the computer program COILS version 2.2) but not to change probabilities of the other two coiled-coils (405 to 451 and 595 to 651 amino acids). The chemical crosslinking experiment (14) showed that U403-Kstalk2-GFP containing the 1362E/L365K mutation was still a dimer (22).
  • 19
    • 2142737604 scopus 로고    scopus 로고
    • note
    • KIF1C, a member of the Un104/KIF1 subfamily, has been shown to dimerize in fibroblasts overexpressing KIF1C, but not under physiological conditions (23).
  • 22
    • 2142673185 scopus 로고    scopus 로고
    • note
    • Data not shown.
  • 24
    • 2142776745 scopus 로고    scopus 로고
    • note
    • We thank U. Wiedemann for support in cloning, N. Stuurman and Y. Cui for helpful discussions, and B. Schnapp for providing rat KIFIA cDNA KIF1A CDNA. Supported by grants from the Howard Hughes Medical Institute and NIH (grant AR42895).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.