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Volumn 125, Issue 37, 2003, Pages 11314-11328

Spectroscopic investigation of stellacyanin mutants: Axial ligand interactions at the blue copper site

Author keywords

[No Author keywords available]

Indexed keywords

ELECTRONIC STRUCTURE; PARAMAGNETIC RESONANCE; SPECTROSCOPIC ANALYSIS;

EID: 0041691318     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja035802j     Document Type: Article
Times cited : (81)

References (100)
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    • note
    • It should be noted that all samples were run both before and after the addition of excess oxidant. For all samples, the S K-edge data remained very similar, except for an increase in the pre-edge intensity of Q99L stellacyanin, consistent with the presence of some reduced copper. Similarly, the overall Cu K-edge shape remained very similar after addition of oxidant. except for the decreased intensity of a feature at ∼8983 eV in Q99L corresponding to the presence of some reduced copper. EPR spectra before and after the addition of oxidant gave equivalent parameters.
  • 32
    • 0004303749 scopus 로고    scopus 로고
    • Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center. Stanford University, Stanford, CA 94309
    • George, G. N. EDG_FIT; Stanford Synchrotron Radiation Laboratory, Stanford Linear Accelerator Center. Stanford University, Stanford, CA 94309.
    • EDG_FIT
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    • EXAFSPAK
    • George, G.N.1
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    • 0041873471 scopus 로고    scopus 로고
    • note
    • There are 6 sulfurs (3 Met and 3 Cys) in WT stellacyanin, 7 sulfurs (4 Met and 3 Cys) in the Q99M mutant, 6 sulfurs (3 Met and 3 Cys) in the Q99L mutant, and 9 sulfurs (3 Cys and 6 Met) in azurin. For all four proteins, all of the sulfurs will contribute to the edge, while only one Cys thiolate contributes to the pre-edge.
  • 60
    • 0042875618 scopus 로고    scopus 로고
    • note
    • The shifts in rising edge background are attributed to both a different total number of sulfurs in the proteins and to differences in copper loading. Fits to the pre-edge region account for the differences in the rising edge background.
  • 61
    • 0042875617 scopus 로고    scopus 로고
    • note
    • It should be noted that both Q99M stellacyanin and azurin have an apparent higher covalency value than plastocyanin.11 All Q99M stellacyanin and azurin samples were fully oxidized and spin quantitated to determine copper loading; thus. these data most likely reflect a more accurate covalency estimate for a classic blue copper site.
  • 62
    • 0041372706 scopus 로고    scopus 로고
    • note
    • It should be noted that for azurin a distant (∼3 Å) Cu-O interaction to a backbone amide carbonyl, trans to the thioether, is sometime discussed, which is not present in the Q99M mutant. However. at this distance, little covalent bonding interaction is present between the Cu and the compact O 2p orbitals, ref 6.
  • 65
    • 0042374511 scopus 로고    scopus 로고
    • note
    • On the basis of the EPR parameters, the additional tightly bound Cu(II) site is significantly less covalent than a TI copper site and thus should have a much less intense shakedown feature. Hence, it is likely that the shakedown feature for the Q99L TI site is even more intense than that of Q99M. This trend is consistent with S K-edge results. It should also be noted that the feature at ∼8983 eV in the Q99L Cu K-edge spectrum corresponds to the presence of a small amount of reduced copper.
  • 66
    • 0041372707 scopus 로고    scopus 로고
    • note
    • The Cu K-edge data indicate a small amount of Cu(I) in oxidized Q99L stellacyanin. This would have only a small effect on the Cu-S distance of Q99L and would if anything make the Cu-S distance slightly longer.
  • 69
    • 0042875616 scopus 로고    scopus 로고
    • note
    • -1) for comparison to Q99L stellacyanin fits. Fits over the shorter data range did not change the Cu-S or Cu-N distances.
  • 70
    • 0041372708 scopus 로고    scopus 로고
    • note
    • It should be noted that the presence of an additional tightty bound four-coordinate copper in Q99L stellacyanin would tend to decrease the intensity of the ∼8984 eV feature, and thus the intensity of this feature should be even greater.
  • 78
    • 0001960802 scopus 로고
    • Carlin, B. L., Ed.; M. Dekker: New York
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    • McGarvey, B.R.1
  • 88
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    • note
    • Cu-S(reduced) is assumed to be the same for WT, Q99M, and Q99L stellacyanin.
  • 91
    • 0010986601 scopus 로고    scopus 로고
    • Messerschmidt, A., Huber, R., Poulos, T., Wieghardt. K.. Eds.; John Wiley and Sons: Chichester
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    • Nersissian, A.M.1    Hart, J.P.2    Valentine, J.S.3
  • 93
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    • Experimentally, the total reorganization energy for stellacyanin is 1.4 times greater than that of plastocyanin. However, this has been attributed to the more exposed nature of the site, which increases the outer sphere contribution to λ (Farver, O.; Pecht, I. Inorg. Chem. 1990, 29, 4855-4858).
    • (1990) Inorg. Chem. , vol.29 , pp. 4855-4858
    • Farver, O.1    Pecht, I.2
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    • -1 in energy. The trigonally distorted tetrahedral structure is similar to the structures on the plateau of the constrained optimization (Figure 10, red line, steps 17-30) with nonequal Cu-N distances. Their tetragonal structure does not compare directly with any point of the optimization pathways discussed here, because the arrangement of the ligands are different.
    • (1998) J. Phys. Chem. B , vol.102 , pp. 4638-4647
    • De Kerpel, J.O.A.1    Pierlot, K.2    Ryde, U.3    Roos, B.O.4


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.