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Femtosecond photolysis of CO-ligated protoheme and hemoproteins: appearance of deoxy species with a 350-fsec time constant.
Open accessAbstract
Photolysis of HbCO, MbCO, and CO-protoheme has been investigated by measuring transient differential spectra and kinetics of induced absorption after excitation with a 250-fsec laser pulse at 307 nm. Probing was performed by a part of a continuum pulse between 395 and 445 nm. Photodissociation of the three liganded species occurred within the pulse duration. By contrast, the formation of deoxy species appeared with a mean (+/- SD) response time of 350 +/- 50 fsec. This time constant was identical for the three species and independent of the presence or absence of the protein structure. Our results suggest the formation of a transient high-spin in plane iron (II) species which relaxes in 350 fsec to a high-spin stable state with concerted kinetics of CO departure and iron displacement. The spin transition is suspected to occur via liganded excited states which relax in part to non-reactive states with a 3.2-psec time constant.
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Cited by
Protein states and proteinquakes.
Ansari, A., Berendzen, J., Bowne, S. F., Frauenfelder, H., Iben, I. E., Sauke, T. B., Shyamsunder, E., & Young, R. D. (1985) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.82.15.5000 · Cited by 828
Sickle Cell Hemoglobin Polymerization
Eaton, W. A., & Hofrichter, J. (1990) · Advances in Protein Chemistry · doi:10.1016/s0065-3233(08)60287-9 · Cited by 623
Breton, J., Martin, J.-L., Migus, A., Antonetti, A., & Orszag, A. (1986) · Proceedings of the National Academy of Sciences · doi:10.1073/pnas.83.14.5121 · Cited by 275
Self-citationKinetics of heme transfer by the Shr NEAT domains of Group A Streptococcus
Ouattara, M., Pennati, A., Devlin, D. J., Huang, Y.-S., Gadda, G., & Eichenbaum, Z. (2013) · Archives of Biochemistry and Biophysics · doi:10.1016/j.abb.2013.08.009 · Cited by 26
Metadata
- Authors
- Martin, J. L., Migus, A., Poyart, C., Lecarpentier, Y., Astier, R., & Antonetti, A.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 1983-01
- Volume
- 80
- Issue
- 1
- Pages
- 173-177
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W1976404178
- Cited by
- 191
- References
- 0
- FWCI
- 4.94
- Type
- journal article
- Language
- en
- Open access
- green
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- CoChat. (2026). Citation check: Femtosecond photolysis of CO-ligated protoheme and hemoproteins: appearance of deoxy species with a 350-fsec time constant. https://app.cochat.ai/papers/10.1073/pnas.80.1.173
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- Martin, J. L., Migus, A., Poyart, C., Lecarpentier, Y., Astier, R., & Antonetti, A. (1983). Femtosecond photolysis of CO-ligated protoheme and hemoproteins: appearance of deoxy species with a 350-fsec time constant. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.80.1.173
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