Classification: Biochemistry Changes in reflectin protein phosphorylation are associated with dynamic irides- cence in squid Michi Izumi*, Alison M. Sweeney*, Daniel DeMartini*, James C. Weaver*, Meghan L. Pow- ers*, Andrea Tao*, Tania V. Silvas*, Ryan M. Kramer†, Wendy J. Crookes-Goodson†, Lydia M. ‡ † ‡ Mäthger , Rajesh R. Naik , Roger T. Hanlon and Daniel E. Morse* *Institute for Collaborative Biotechnologies, Materials Research Laboratory, California Nano- Systems Institute and the Department of Molecular, Cellular and Developmental Biology, Uni- versity of California, Santa Barbara, Santa Barbara, CA 93106; †Materials and Manufacturing Directorate, Air Force Research Laboratory, Wright-Patterson AFB, OH 45433; ‡Marine Biolog- ical Laboratory, Woods Hole, MA 02543 §To whom correspondence should be addressed. E-mail:
[email protected],
[email protected] Corresponding author: Daniel E. Morse University of California, Santa Barbara, Santa Barbara, CA 93106 Tel: 805-893-7442 Fax: 805-893-2998 Manuscript information: Number of text pages; 21 Number of figures; 6 Abbreviations: ACh, acetylcholine; mAChRs, muscarinic acetylcholine receptors; DTT, dithiothreitol; HPLC, high performance liquid chromatography; IEF, isoelectric focusing; PVDF, polyvinylidene fluoride; HRP, horseradish peroxidase; MALDI-TOF MS, matrix-assisted laser desorption time-of-flight mass spectroscopy; RM, reflectin mo- tif; PKC, protein kinase C Abstract Many cephalopods exhibit remarkable dermal iridescence, a component of their complex, dynamic camouflage