Using mRNA sequencing and de novo transcriptome assembly, Lambert et al. identified, cloned, and characterized nine previously undiscovered fluorescent protein homologs from Aequorea victoria and a related Aequorea species, finding that most sequences were highly divergent from the well-known and widely used A. victoria green fluorescent protein (GFP). Among these fluorescent proteins are the brightest GFP homolog yet characterized and a reversibly photochromic fluorescent protein that responds to UV and blue light. Beyond green emitters, Aequorea species express purple- and blue-pigmented chromoproteins with absorbances ranging from green to far-red, including two that are photoconvertible. X-ray crystallography revealed that Aequorea chromoproteins contain a chemically novel chromophore with an unexpected crosslink to the main polypeptide chain. Because of the unique attributes of several of these newly discovered fluorescent proteins, the authors expect that Aequorea will, once again, give rise to an entirely new generation of useful probes for bioimaging and biosensing. The image shows solutions of five purified recombinant proteins from Aequorea species, illuminated with 480-nm LED (top) and white light (bottom).
Image Credit: pbio.3000936
Editorial
Epidemics on the move: Climate change and infectious disease
PLOS Biology: published November 24, 2020 | https://doi.org/10.1371/journal.pbio.3001013
Essays
Effects of climate change on parasites and disease in estuarine and nearshore environments
PLOS Biology: published November 24, 2020 | https://doi.org/10.1371/journal.pbio.3000743
Understanding how temperature shifts could impact infectious disease
PLOS Biology: published November 24, 2020 | https://doi.org/10.1371/journal.pbio.3000938
Building resilience to mosquito-borne diseases in the Caribbean
PLOS Biology: published November 24, 2020 | https://doi.org/10.1371/journal.pbio.3000791
Climate change and disease in plant communities
PLOS Biology: published November 24, 2020 | https://doi.org/10.1371/journal.pbio.3000949
We need to keep a reproducible trace of facts, predictions, and hypotheses from gene to function in the era of big data
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000999
Superspreading events in the transmission dynamics of SARS-CoV-2: Opportunities for interventions and control
PLOS Biology: published November 12, 2020 | https://doi.org/10.1371/journal.pbio.3000897
Unsolved Mystery
Find and fuse: Unsolved mysteries in sperm–egg recognition
PLOS Biology: published November 13, 2020 | https://doi.org/10.1371/journal.pbio.3000953
Perspectives
Monitor for COVID-19 vaccine resistance evolution during clinical trials
PLOS Biology: published November 9, 2020 | https://doi.org/10.1371/journal.pbio.3001000
Common ground: The foundation of interdisciplinary research on bat disease emergence
PLOS Biology: published November 9, 2020 | https://doi.org/10.1371/journal.pbio.3000947
Research Articles
Evolution and lineage dynamics of a transmissible cancer in Tasmanian devils
PLOS Biology: published November 24, 2020 | https://doi.org/10.1371/journal.pbio.3000926
Many, but not all, lineage-specific genes can be explained by homology detection failure
PLOS Biology: published November 2, 2020 | https://doi.org/10.1371/journal.pbio.3000862
The noncoding small RNA SsrA is released by Vibrio fischeri and modulates critical host responses
PLOS Biology: published November 3, 2020 | https://doi.org/10.1371/journal.pbio.3000934
Rules warp feature encoding in decision-making circuits
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000951
Integrating when and what information in the left parietal lobe allows language rule generalization
PLOS Biology: published November 2, 2020 | https://doi.org/10.1371/journal.pbio.3000895
Computational imaging during video game playing shows dynamic synchronization of cortical and subcortical networks of emotions
PLOS Biology: published November 12, 2020 | https://doi.org/10.1371/journal.pbio.3000900
A multi-scale cortical wiring space links cellular architecture and functional dynamics in the human brain
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000979
Cortical morphology at birth reflects spatiotemporal patterns of gene expression in the fetal human brain
PLOS Biology: published November 23, 2020 | https://doi.org/10.1371/journal.pbio.3000976
Task-related activity in human visual cortex
PLOS Biology: published November 6, 2020 | https://doi.org/10.1371/journal.pbio.3000921
Independent representations of self-motion and object location in barrel cortex output
PLOS Biology: published November 3, 2020 | https://doi.org/10.1371/journal.pbio.3000882
Temporal coding of echo spectral shape in the bat auditory cortex
PLOS Biology: published November 10, 2020 | https://doi.org/10.1371/journal.pbio.3000831
Budgerigars have complex sleep structure similar to that of mammals
PLOS Biology: published November 17, 2020 | https://doi.org/10.1371/journal.pbio.3000929
Hippocampal neurons with stable excitatory connectivity become part of neuronal representations
PLOS Biology: published November 3, 2020 | https://doi.org/10.1371/journal.pbio.3000928
Hippocampal cells integrate past memory and present perception for the future
PLOS Biology: published November 18, 2020 | https://doi.org/10.1371/journal.pbio.3000876
The M-current works in tandem with the persistent sodium current to set the speed of locomotion
PLOS Biology: published November 13, 2020 | https://doi.org/10.1371/journal.pbio.3000738
Gradient in cytoplasmic pressure in germline cells controls overlying epithelial cell morphogenesis
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000940
Local retinoic acid signaling directs emergence of the extraocular muscle functional unit
PLOS Biology: published November 17, 2020 | https://doi.org/10.1371/journal.pbio.3000902
Structural myelin defects are associated with low axonal ATP levels but rapid recovery from energy deprivation in a mouse model of spastic paraplegia
PLOS Biology: published November 16, 2020 | https://doi.org/10.1371/journal.pbio.3000943
Blood–brain barrier genetic disruption leads to protective barrier formation at the Glia Limitans
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000946
TOP1α, UPF1, and TTG2 regulate seed size in a parental dosage–dependent manner
PLOS Biology: published November 6, 2020 | https://doi.org/10.1371/journal.pbio.3000930
Nucleotide de novo synthesis increases breast cancer stemness and metastasis via cGMP-PKG-MAPK signaling pathway
PLOS Biology: published November 13, 2020 | https://doi.org/10.1371/journal.pbio.3000872
EphrinB1 modulates glutamatergic inputs into POMC-expressing progenitors and controls glucose homeostasis
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000680
NOX5-induced uncoupling of endothelial NO synthase is a causal mechanism and theragnostic target of an age-related hypertension endotype
PLOS Biology: published November 10, 2020 | https://doi.org/10.1371/journal.pbio.3000885
Membrane progesterone receptor induces meiosis in Xenopus oocytes through endocytosis into signaling endosomes and interaction with APPL1 and Akt2
PLOS Biology: published November 2, 2020 | https://doi.org/10.1371/journal.pbio.3000901
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Unifying the mechanism of mitotic exit control in a spatiotemporal logical model
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Ribosome biogenesis is a downstream effector of the oncogenic U2AF1-S34F mutation
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A network medicine approach to investigation and population-based validation of disease manifestations and drug repurposing for COVID-19
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Acetylation-mediated remodeling of the nucleolus regulates cellular acetyl-CoA responses
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Structure of the Lifeact–F-actin complex
PLOS Biology: published November 20, 2020 | https://doi.org/10.1371/journal.pbio.3000925
Short Reports
Transmissible cancers and the evolution of sex under the Red Queen hypothesis
PLOS Biology: published November 19, 2020 | https://doi.org/10.1371/journal.pbio.3000916
Little evidence for an effect of smoking on multiple sclerosis risk: A Mendelian Randomization study
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000973
Methods and Resources
Generation and validation of versatile inducible CRISPRi embryonic stem cell and mouse model
PLOS Biology: published November 30, 2020 | https://doi.org/10.1371/journal.pbio.3000749
SCRINSHOT enables spatial mapping of cell states in tissue sections with single-cell resolution
PLOS Biology: published November 20, 2020 | https://doi.org/10.1371/journal.pbio.3000675
SiCTeC: An inexpensive, easily assembled Peltier device for rapid temperature shifting during single-cell imaging
PLOS Biology: published November 6, 2020 | https://doi.org/10.1371/journal.pbio.3000786
Aequorea’s secrets revealed: New fluorescent proteins with unique properties for bioimaging and biosensing
PLOS Biology: published November 2, 2020 | https://doi.org/10.1371/journal.pbio.3000936
Improved genetically encoded near-infrared fluorescent calcium ion indicators for in vivo imaging
PLOS Biology: published November 24, 2020 | https://doi.org/10.1371/journal.pbio.3000965