| Literature DB >> 11605970 |
Abstract
The heme-globin complexes of hemoglobin and myoglobin are investigated in positive-ion mode and negative-ion mode using a nano-ESI source coupled to a quadrupole ion trap MS and an orthogonal time-of-flight MS. The extent of dissociation of these noncovalent complexes upon collisional activation and thus their gas-phase stability is strongly dependent on the polarity of the ESI-MS experiment as well as on the charge of the prosthetic group (ferri-heme [Fe3+-heme]+ vs. ferro-heme [Fe2+-heme]+/-0). The results clearly point to the important role of electrostatic interactions on the gas phase stability of noncovalent complexes and therefore the ion signals observed in ESI-MS experiments.Entities:
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Year: 2001 PMID: 11605970 DOI: 10.1016/S1044-0305(01)00294-X
Source DB: PubMed Journal: J Am Soc Mass Spectrom ISSN: 1044-0305 Impact factor: 3.109