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Abstract:

The Root effect describes the drastic drop of oxygen affinity and loss of cooperativity at acidic pH expressed in the hemoglobins (Hb) of certain fish. The comparison between the deoxy structures of the Root effect Hb from the Antarctic fish Trematomus bernacchii (HbTb) at different pHs (pH = 6.2 and pH = 8.4) shows that the most significant differences are localized at the CDα region, where a salt bridge between Asp48 and His55 breaks during the low-to-high pH transition. In order to shed light on the relationship between pH, CDα loop structure and dynamics, and oxygen access to the active site in the alpha chain of HbTb, different computer simulation techniques were performed. Our results highlight the importance of the protonation of His55 in regulating oxygen access, underscoring its pivotal role in the structural and functional properties of HbTb. These data provide further support to the hypothesis that this residue might contribute to the release of Root protons in HbTb and underline the fact that an efficient transport of molecular oxygen in Hbs relies on a subtle balance of tertiary structure and protein conformational flexibility. © 2011 IUBMB.

Registro:

Documento: Artículo
Título:Protonation of histidine 55 affects the oxygen access to heme in the alpha chain of the hemoglobin from the Antarctic fish Trematomus bernacchii
Autor:Boechi, L.; Martaì, M.A.; Vergara, A.; Sica, F.; Mazzarella, L.; Estrin, D.A.; Merlino, A.
Filiación:Departamentos de Química Biologica y Química Inorgánica, Analítica y Química-Física (INQUIMAE-CONICET), Universidad de Buenos Aires, Ciudad de Buenos Aires, Argentina
Istituto di Biostrutture e Bioimmagini, (C.N.R.), via Mezzocannone 16, Napoli I-80134, Italy
Dipartimento di Chimica Paolo Corradini, Universiàdegli Studi di Napoli Federico II, via Cintia, I-80126 Napoli, Italy
Palabras clave:hemoglobin; implicit ligand sampling; molecular dynamics simulations; oxygen binding; pH; Trematomus bernacchii; hemoglobin; histidine; Antarctica; computer simulation; conference paper; controlled study; fish; human; nonhuman; oxygen affinity; protein conformation; protein function; protein structure; proton transport; trematomus bernacchii; Animals; Antarctic Regions; Heme; Hemoglobins; Histidine; Models, Molecular; Oxygen; Protons; Trematomus bernacchii
Año:2011
Volumen:63
Número:3
Página de inicio:175
Página de fin:182
DOI: http://dx.doi.org/10.1002/iub.436
Título revista:IUBMB Life
Título revista abreviado:IUBMB Life
ISSN:15216543
CODEN:IULIF
CAS:hemoglobin, 9008-02-0; histidine, 645-35-2, 7006-35-1, 71-00-1; Heme, 14875-96-8; Hemoglobins; Histidine, 71-00-1; Oxygen, 7782-44-7; Protons
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_15216543_v63_n3_p175_Boechi

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Citas:

---------- APA ----------
Boechi, L., Martaì, M.A., Vergara, A., Sica, F., Mazzarella, L., Estrin, D.A. & Merlino, A. (2011) . Protonation of histidine 55 affects the oxygen access to heme in the alpha chain of the hemoglobin from the Antarctic fish Trematomus bernacchii. IUBMB Life, 63(3), 175-182.
http://dx.doi.org/10.1002/iub.436
---------- CHICAGO ----------
Boechi, L., Martaì, M.A., Vergara, A., Sica, F., Mazzarella, L., Estrin, D.A., et al. "Protonation of histidine 55 affects the oxygen access to heme in the alpha chain of the hemoglobin from the Antarctic fish Trematomus bernacchii" . IUBMB Life 63, no. 3 (2011) : 175-182.
http://dx.doi.org/10.1002/iub.436
---------- MLA ----------
Boechi, L., Martaì, M.A., Vergara, A., Sica, F., Mazzarella, L., Estrin, D.A., et al. "Protonation of histidine 55 affects the oxygen access to heme in the alpha chain of the hemoglobin from the Antarctic fish Trematomus bernacchii" . IUBMB Life, vol. 63, no. 3, 2011, pp. 175-182.
http://dx.doi.org/10.1002/iub.436
---------- VANCOUVER ----------
Boechi, L., Martaì, M.A., Vergara, A., Sica, F., Mazzarella, L., Estrin, D.A., et al. Protonation of histidine 55 affects the oxygen access to heme in the alpha chain of the hemoglobin from the Antarctic fish Trematomus bernacchii. IUBMB Life. 2011;63(3):175-182.
http://dx.doi.org/10.1002/iub.436