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Volumn 309, Issue 5743, 2005, Pages 2057-2060

Biochemistry: Direct observation of the three-state folding of a single protein molecule

Author keywords

[No Author keywords available]

Indexed keywords

BIOCHEMISTRY; ENZYME KINETICS; ESCHERICHIA COLI; MOLECULAR ORIENTATION;

EID: 25444512161     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.1116702     Document Type: Article
Times cited : (544)

References (32)
  • 19
    • 25444449937 scopus 로고    scopus 로고
    • note
    • See supporting data on Science Online.
  • 20
    • 25444438603 scopus 로고    scopus 로고
    • note
    • Single-molecule tethers were recognized by identifying the overstretching transition due to the DNA handles. Only those fibers that exhibited an over-stretching transition of the expected length (∼230 nm) at the correct force (∼67 pN) for a single fiber containing 1116-base pair DNA were selected for analysis.
  • 23
    • 25444528850 scopus 로고    scopus 로고
    • note
    • N→U appears to be large when the stabilizing interactions are predominantly long-range hydrophobic interactions, and small when they consist of clusters of short-range interstrand hydrogen bonds (6, 30). The value of 2 nm measured here for RNase H is on the higher end of the distribution of transition-state distances obtained for other proteins using the AFM (0.25 to 1.7 nm) [(26) and references therein].
  • 29
    • 25444462649 scopus 로고    scopus 로고
    • note
    • The I53D RNase H variant did not exhibit any low-force unfolding transitions; refolding occurred as a gradual compaction rather than as a single sharp transition, and hopping was not observed at any force examined. Refolding to the native state was qualitatively slower for the I53D variant, which suggests that the formation of the molten globule-like intermediate of RNase H speeds up the attainment of its folded state. This is consistent with bulk kinetic studies that suggest that folding can be accelerated if the interactions that stabilize the intermediate stabilize the transition state structure to an even greater extent (28).
  • 32
    • 25444503647 scopus 로고    scopus 로고
    • note
    • We thank R. Dahlquist for support and experimental advice in the early stages of this work, and the Marqusee and Bustamante labs for helpful discussions. Supported by NIH grants GM50945 (S.M.) and GM32543 (C.B.), U.S. Department of Energy grant AC0376Sf00098 (C.B.), NIH training grant GM008295 (E.A.S.), and a NSF predoctoral fellowship (E.A.S.).


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.