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StatusReference proteome
Proteinsi <p>Number of protein entries associated with this proteome: UniProtKB entries for regular proteomes or UniParc entries for redundant proteomes (<a href="/help/proteome%5Fredundancy">more...</a>)</p> 1,199
Gene counti <p>This is the total number of unique genes found in the proteome set, algorithmically computed. For each gene, a single representative protein sequence is chosen from the proteome. Where possible, reviewed (Swiss-Prot) protein sequences are chosen as the representatives.</p> - Download one protein sequence per gene (FASTA)
Proteome IDi <p>The proteome identifier (UPID) is the unique identifier assigned to the set of proteins that constitute the <a href="">proteome</a>. It consists of the characters 'UP' followed by 9 digits, is stable across releases and can therefore be used to cite a UniProt proteome.<p><a href='/help/proteome_id' target='_top'>More...</a></p>UP000001405
Taxonomy1453429 - Atelocyanobacterium thalassa (isolate ALOHA)
Last modifiedJanuary 15, 2020
Genome assembly and annotationi <p>Identifier for the genome assembly (<a href="">more...</a>)</p> GCA_000025125.1 from ENA/EMBL full
Pan proteomei <p>A pan proteome is the full set of proteins thought to be expressed by a group of highly related organisms (e.g. multiple strains of the same bacterial species).<p><a href='/help/pan_proteomes' target='_top'>More...</a></p> This proteome is part of the Atelocyanobacterium thalassa (isolate ALOHA) pan proteome (fasta)
CompletenessClose to Standard

Cyanobacteria are (usually) oxygenic, phototrophic organisms. They normally encode two photosystems (PSI and PSII) releasing electrons from water and fix carbon dioxide via the Calvin-Benson-Bassham pathway. Thus they absorb large quantities of C(O)2 and produce (O)2. Some cyanobacteria are also able to fix (N)2.

Candidatus Atelocyanobacterium thalassa (formerly UCYN-A) is a globally distributed, periodically abundant (N)2-fixing marine cyanobacterium. It was recently found to lack the oxygen producing PSII complex of the photosynthetic apparatus, indicating a novel metabolism. DNA was sequenced from UCYN-A cells collected at Station ALOHA in the North Pacific subtropical gyre 100 km north of Hawaii at 15 m depth. At 1.44 Mb the genome is unusually small for a cyanobacterium and lacks a number of major metabolic pathways including enzymes for carbon fixation, the tricarboxylic acid cycle, the Calvin cycle, biosynthesis of several amino acids and de novo purine biosynthesis, but retains sufficient electron transport capacity to generate energy and reducing power from light. The metabolic potential defined by the genome indicates that UCYN-A is either an obligate endosymbiont of a cryptic symbiotic partner or that it is adapted to obtain organic nutrition from the low concentration of organic matter in the ocean, perhaps during the demise of phytoplankton blooms (adapted from PMID 20173737). Subsequent characterization has shown it is loosely associated with a unicellular Prymnesiophyte, a picoeukaryote which may be calcifying. The cyanobacterium provides fixed nitrogen, probably in return for fixed carbon (PMID 22997339).

Componentsi <p>Genomic components encoding the proteome</p>

Component nameGenome Accession(s)
Component representationProteins


  1. "Metabolic streamlining in an open-ocean nitrogen-fixing cyanobacterium."
    Tripp H.J., Bench S.R., Turk K.A., Foster R.A., Desany B.A., Niazi F., Affourtit J.P., Zehr J.P.
    Nature 464:90-94(2010) [PubMed] [Europe PMC] [Abstract]
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