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Dynamic pigmentary and structural coloration within cephalopod chromatophore organs. 2019
Thomas L Williams, and
Stephen L Senft, and
Jingjie Yeo, and
Francisco J Martín-Martínez, and
Alan M Kuzirian, and
Camille A Martin, and
Christopher W DiBona, and
Chun-Teh Chen, and
Sean R Dinneen, and
Hieu T Nguyen, and
Conor M Gomes, and
Joshua J C Rosenthal, and
Matthew D MacManes, and
Feixia Chu, and
Markus J Buehler, and
Roger T Hanlon, and
Leila F Deravi
Department of Chemistry and Chemical Biology, Northeastern University, Boston, MA, 02115, USA.
Chromatophore organs in cephalopod skin are known to produce ultra-fast changes in appearance for camouflage and communication. Light-scattering pigment granules within chromatocytes have been presumed to be the sole source of coloration in these complex organs. We report the discovery of structural coloration emanating in precise register with expanded pigmented chromatocytes. Concurrently, using an annotated squid chromatophore proteome together with microscopy, we identify a likely biochemical component of this reflective coloration as reflectin proteins distributed in sheath cells that envelop each chromatocyte. Additionally, within the chromatocytes, where the pigment resides in nanostructured granules, we find the lens protein Ω- crystallin interfacing tightly with pigment molecules. These findings offer fresh perspectives on the intricate biophotonic interplay between pigmentary and structural coloration elements tightly co-located within the same dynamic flexible organ - a feature that may help inspire the development of new classes of engineered materials that change color and pattern.
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