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Although cryptophyte algae are known to show a diverse range of spectroscopic properties, the complex electronic structures and photophysical properties of their pigment molecules, known as bilins, are not yet fully understood, particularly in terms of how the surrounding protein environment influences them. In this study, we performed quantum mechanics\/molecular mechanics simulations with excited-state calculations utilizing a numerically efficient density functional tight-binding method to examine the structural dynamics and optical features of bilin molecules within an open-form PC612 complex. Our results indicate that the protein matrix significantly controls the fluctuations of excitation energies and excitonic couplings of the pigment network. Very different from (bacterio)chlorophyll-containing systems, thermal fluctuations induced by the environment have a minimal effect on the pigment spectral densities due to similar electron density distributions in the ground and excited states. The computed absorption spectra, calculated at different temperatures, are in reasonable agreement with the experimental counterparts, accurately predicting the relative peak positions and confirming the validity of our findings.<\/jats:p>","DOI":"10.1021\/acs.jpcb.6c03535","type":"journal-article","created":{"date-parts":[[2026,9,10]],"date-time":"2026-09-10T17:01:22Z","timestamp":1789059682000},"page":"9792-9804","source":"Crossref","is-referenced-by-count":0,"title":["Structural Dynamics\nand Optical Spectra of the Phycobiliprotein\nPC612 Complex"],"prefix":"10.1021","volume":"130","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8333-3422","authenticated-orcid":true,"given":"Dongyu","family":"Lyu","sequence":"first","affiliation":[{"name":"Constructor University , , Campus Ring 1 , ,","place":["Bremen, Germany, 28759"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8758-594X","authenticated-orcid":true,"given":"Sayan","family":"Maity","sequence":"additional","affiliation":[{"name":"Constructor University , , Campus Ring 1 , ,","place":["Bremen, Germany, 28759"]},{"name":"University College London , , ,","place":["London, U.K., WC1E 6BT"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6114-7431","authenticated-orcid":true,"given":"Ulrich","family":"Kleinekatho\u0308fer","sequence":"additional","affiliation":[{"name":"Constructor University , , Campus Ring 1 , ,","place":["Bremen, Germany, 28759"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"316","published-online":{"date-parts":[[2026,9,10]]},"reference":[{"key":"2026092408091529400_cit1","doi-asserted-by":"crossref","DOI":"10.1142\/3609","volume-title":"Photosynthetic\nExcitons","author":"van Amerongen","year":"2000"},{"key":"2026092408091529400_cit2","doi-asserted-by":"publisher","first-page":"763","DOI":"10.1038\/nchem.1145","article-title":"Lessons from\nNature About Solar Light Harvesting","volume":"3","author":"Scholes","year":"2011","journal-title":"Nat. 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Phycol."},{"key":"2026092408091529400_cit6","doi-asserted-by":"publisher","DOI":"10.1002\/pro.4586","article-title":"Molecular\nStructures Reveal the Origin of Spectral Variation in Cryptophyte\nLight Harvesting Antenna Proteins","volume":"32","author":"Michie","year":"2023","journal-title":"Protein Sci."},{"key":"2026092408091529400_cit7","doi-asserted-by":"publisher","first-page":"7315","DOI":"10.1016\/S0021-9258(18)42521-5","article-title":"Phycobilins of Cryptophycean\nAlgae Occurrence of Dihydrobiliverdin and Mesobiliverdin in Cryptomonad\nBiliproteins","volume":"267","author":"Wedemayer","year":"1992","journal-title":"J. Biol. Chem."},{"key":"2026092408091529400_cit8","doi-asserted-by":"publisher","first-page":"79","DOI":"10.1006\/jmbi.1995.0203","article-title":"Evolution\nof the Phycobiliproteins","volume":"248","author":"Apt","year":"1995","journal-title":"J. Mol. 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