Biology:Proline-rich protein 30

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A representation of the 3D structure of the protein myoglobin showing turquoise α-helices.
Generic protein structure example

Proline-rich protein 30 (PRR30 or C2orf53) is a protein in humans that is encoded for by the PRR30 gene.[1] PRR30 is a member in the family of Proline-rich proteins characterized by their intrinsic lack of structure. Copy number variations in the PRR30 gene have been associated with an increased risk for neurofibromatosis.

Gene

The PRR30 gene is located on the short arm of human chromosome 2 at band 2p23.3. It flanked by Prolactin regulatory element binding (PREB) and Transcription Factor 23 (TCF23). The gene has three Exons in total. PRR30 has a length of 2618 base pairs of linear DNA.[2]

PRR30 Gene Neighborhood[3]

Promoter Region

The PRR30 promoter directly flanks the gene and is 1162 base pairs in length.[4]

Transcript

The PRR30 mRNA transcript is 2063 base pairs in length. There are four splice sites total all of which are in the 5’ UTR. There are no known isoforms or alternative splicing of PRR30.

  • PRR30 Splice Pattern

Protein

Human protein PRR30 consists of 412 amino acid residues. It has a molecular weight of 44.7 kdal and an isoelectric point of 10.7.[5][6] It is proline rich and composed primarily of non-essential amino acids. There is a region of extreme conservation across orthologs spanning from residues 187 to 321.[7] PRR30 appears to be subcellularly localized to the cell nucleus.[8] NetNES predicts a nuclear export signal from residues 213 to 216.[9] IntAct predicts that PRR30 interacts with Human Testis Protein 37 or TEX37, Cystiene Rich Tail Protein 1 (CYSRT1), and Keratin Associated Protein 6-2 (KRTAP6-2).[10] PRR30 is predicted to undergo post-translational modifications in the form of glycosylation and phosphorylation.[11][12][13]

Adapted Prosite figure showing domains, phosphorylation sites (red), glycosylation sites (grey), and nuclear export signal (green).[14]
I-Tasser predicted protein PRR30. Largely unstructured with minimal folding in highly conserved region.[15]

Structure

PRR30 is an intrinsically disordered protein (IDP) and lacks any formal tertiary structure or quaternary structure.[8] I-Tasser and Phyre predict minimal coiling throughout PRR30 as a whole. In the region of high conservation, there are predicted alpha helices & beta sheets.[15][16]

Function

Unstructured proteins like PRR30 are highly variable in function.[17] Other Proline-Rich Proteins have been shown to have an affinity for binding calcium across different tissues in the human body.[18][19] COACH predicts several ligand binding domains associated with calcium across PRR30. The highest confidence predicted calcium binding domain resides in the area of greatest conservation.[20][21]

Expression

NCBI EST profiles have shown differential expression across many tissues but increased levels in the human testes and pharynx.[22]

Homology

PRR30 is exclusive to mammals but is not present in all mammals. PRR30 is highly conserved across Primates but shows loss of the gene in members of Rodents and Laurasiatheria.[23] The most distant known ortholog of PRR30 is found in S. harrisii, Tasmanian Devil. The PRR30 gene appears to be evolving relatively fast rate.[24]

Comparison of evolutionary histories between Cytochrome C (grey), Fibrinogen (orange), and PRR30 (blue).[25]

Paralogs

There are no known paralogs for PRR30.[26]

Orthologs

Genus & Species[27] Sequence Identity[27] Date of Divergence (MYA)[27] Sequence Length[27]
Homo sapiens/Human 100% 0 412
Pan paniscus 99% 6.4 412
Pan troglodytes/Chimpanzee 99% 6.4 412
Pongo pygmaeus/Bornean orangutan 93% 15.2 413
Nomascus leucogenys 94% 19.43 412
Gorilla gorilla/Western gorilla 96% 8.61 412
Macaca fascicularis 93% 28.1 412
Papio anubis 93% 28.1 412
Macaca nemestrina 93% 28.1 412
Acinonyx jubatus 66% 94 394
Bos taurus 65% 94 396
Bos indicus 65% 94 396
Heterocephalus glaber 57% 88 373
Cavia porcellus 54% 88 391
Octodon degus 61% 88 402
Mus musculus 52% 88 399
Echinops telfairi 61% 102 313
Erinaceus europaeus 57% 94 375
Tupaia chinensis 68% 85 410
Sorex araneus 59% 94 298
Elephantulus edwardii 51% 102 286
Rhinolophus sinicus 68% 94 359
Miniopterus natalensis 63% 94 396
Myotis brandtii 64% 94 239
Sarcophilus harrisii 57% 160 376
  • This list is not comprehensive

Clinical significance

From a study on Neurofibromatosis, this graph shows that patients afflicted with Neurofibromatosis Type 1 are likely to have an extra copy of C2orf53.[28]

In recent 2015 study, copy number variation of PRR30 gene was linked to an increase risk for neurofibromatosis. 78% of the patients displaying type 1-associated cutaneous neurofibromas carried an extra copy of the PRR30 gene. No mechanism was described illuminating the correlation.[28]

References

  1. ↑ "hORFeome v3.1: a resource of human open reading frames representing over 10,000 human genes". Genomics 89 (3): 307–315. March 2007. doi:10.1016/j.ygeno.2006.11.012. PMID 17207965. 
  2. ↑ 7. NCBI (National Center for Biotechnology Information) entry on PRR30 https://www.ncbi.nlm.nih.gov/nuccore/148236530
  3. ↑ "PRR30 proline rich 30 [Homo sapiens (human) - Gene - NCBI"]. https://www.ncbi.nlm.nih.gov/gene/339779. 
  4. ↑ "Genomatix: Genomatix Genome Browser" (in en-US). https://www.genomatix.de/cgi-bin/eldorado/eldorado.pl?s=0d4295709edb5d3e8d1d799d0a13f6f4;SVG=PRR30;ELDORADO_VERSION=E32R1605. 
  5. ↑ "Methods and algorithms for statistical analysis of protein sequences". Proceedings of the National Academy of Sciences of the United States of America 89 (6): 2002–2006. March 1992. doi:10.1073/pnas.89.6.2002. PMID 1549558. Bibcode: 1992PNAS...89.2002B. 
  6. ↑ Volker Brendel, Department of Mathematics, Stanford University, Stanford CA 94305, U.S.A., modified; any errors are due to the modification.[clarification needed]
  7. ↑ "CLUSTAL W: improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choice". Nucleic Acids Research 22 (22): 4673–4680. November 1994. doi:10.1093/nar/22.22.4673. PMID 7984417. 
  8. ↑ 8.0 8.1 "PredictProtein - Protein Sequence Analysis, Prediction of Structural and Functional Features" (in en). https://www.predictprotein.org/visual_results?req_id=575963. 
  9. ↑ "Analysis and prediction of leucine-rich nuclear export signals". Protein Engineering, Design & Selection 17 (6): 527–536. June 2004. doi:10.1093/protein/gzh062. PMID 15314210. 
  10. ↑ "The MIntAct project--IntAct as a common curation platform for 11 molecular interaction databases". Nucleic Acids Research 42 (Database issue): D358–D363. January 2014. doi:10.1093/nar/gkt1115. PMID 24234451. 
  11. ↑ "Prediction of post-translational glycosylation and phosphorylation of proteins from the amino acid sequence". Proteomics 4 (6): 1633–1649. June 2004. doi:10.1002/pmic.200300771. PMID 15174133. 
  12. ↑ "Sequence and structure-based prediction of eukaryotic protein phosphorylation sites". Journal of Molecular Biology 294 (5): 1351–1362. December 1999. doi:10.1006/jmbi.1999.3310. PMID 10600390. 
  13. ↑ Prediction of N-glycosylation sites in human proteins. (Report). 2004. 
  14. ↑ "PROSITE" (in en-US). http://prosite.expasy.org/cgi-bin/prosite/mydomains/. 
  15. ↑ 15.0 15.1 "I-TASSER server for protein 3D structure prediction". BMC Bioinformatics 9: 40. January 2008. doi:10.1186/1471-2105-9-40. PMID 18215316. 
  16. ↑ "The Phyre2 web portal for protein modeling, prediction and analysis". Nature Protocols 10 (6): 845–858. June 2015. doi:10.1038/nprot.2015.053. PMID 25950237. 
  17. ↑ "Intrinsically disordered protein". Journal of Molecular Graphics & Modelling 19 (1): 26–59. 2001. doi:10.1016/s1093-3263(00)00138-8. PMID 11381529. 
  18. ↑ "The primary structure of a salivary calcium-binding proline-rich phosphoprotein (protein C), a possible precursor of a related salivary protein A". The Journal of Biological Chemistry 255 (12): 5943–5948. June 1980. doi:10.1016/S0021-9258(19)70721-2. PMID 7380845. 
  19. ↑ "Salivary proline-rich proteins". Molecular and Cellular Biochemistry 45 (2): 83–99. June 1982. doi:10.1007/bf00223503. PMID 6810092. 
  20. ↑ "BioLiP: a semi-manually curated database for biologically relevant ligand-protein interactions". Nucleic Acids Research 41 (Database issue): D1096–D1103. January 2013. doi:10.1093/nar/gks966. PMID 23087378. 
  21. ↑ "Protein-ligand binding site recognition using complementary binding-specific substructure comparison and sequence profile alignment". Bioinformatics 29 (20): 2588–2595. October 2013. doi:10.1093/bioinformatics/btt447. PMID 23975762. 
  22. ↑ Group, Schuler. "EST Profile - Hs.136555". https://www.ncbi.nlm.nih.gov/UniGene/ESTProfileViewer.cgi?uglist=Hs.136555. 
  23. ↑ "Gene: PRR30 (ENSG00000186143) - Gene gain/loss tree - Homo sapiens - Ensembl genome browser 88" (in en-gb). http://www.ensembl.org/Homo_sapiens/Gene/SpeciesTree?collapse=none;db=core;g=ENSG00000186143;r=2:27136848-27139410. 
  24. ↑ "Ortholog Search | cegg.unige.ch Computational Evolutionary Genomics Group". http://www.orthodb.org/?level=&species=&query=EOG090B0FOJ. 
  25. ↑ "Gene: PRR30 (ENSG00000186143) - Gene tree - Homo sapiens - Ensembl genome browser 88" (in en-gb). http://www.ensembl.org/Homo_sapiens/Gene/Compara_Tree?collapse=none;db=core;g=ENSG00000186143;r=2:27136848-27139410. 
  26. ↑ "PRR30 Gene - GeneCards | PRR30 Protein | PRR30 Antibody". GeneCards Human Gene Databas. https://www.genecards.org/cgi-bin/carddisp.pl?gene=PRR30#paralogs. 
  27. ↑ 27.0 27.1 27.2 27.3 "Basic local alignment search tool". Journal of Molecular Biology 215 (3): 403–410. October 1990. doi:10.1006/jmbi.1990.9999. PMID 2231712. 
  28. ↑ 28.0 28.1 "High-resolution 400K oligonucleotide array comparative genomic hybridization analysis of neurofibromatosis type 1-associated cutaneous neurofibromas". Gene 558 (2): 220–226. March 2015. doi:10.1016/j.gene.2014.12.064. PMID 25562418. 



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