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Proline

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  • First Online:
Encyclopedia of Astrobiology

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Synonyms

Pro; Pyrrolidine-2-carboxylic acid

Definition

Proline, C5H9NO2, is one of the 20 protein amino acids. The amine in proline is a secondary amine (Fig. 1), whereas the other 19 coded amino acids all contain primary (−NH2) amino groups. Its three-letter symbol is Pro, and its one-letter symbol is P. It has a molecular weight of 115.13, and its isoelectric point is 6.30. Proline is a hydrophobic amino acid. Since it contains a secondary amino group, its reactivity is different from that of the other amino acids, and special care is needed for its determination. For example, the reaction product of proline with ninhydrin is of a different color from that of the other coded amino acids.

Fig. 1
figure 1

Structure of proline

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Authors and Affiliations

  1. Yokohama National University, 240-8501, Yokohama, Japan

    Kensei Kobayashi

Authors
  1. Kensei Kobayashi
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Correspondence to Kensei Kobayashi .

Editor information

Editors and Affiliations

  1. Centro de Biología Molecular, Universidad Autónoma de Madrid, Madrid, Spain

    Ricardo Amils

  2. Labo. d'Astrophysique de Bordeaux (LAB), Observatoire Aquitain des Sciences de l'Univers (OASU), Floirac CX, France

    Muriel Gargaud

  3. Centro de Astrobiología (CAB), Inst. Nacional de Técnica Aeroespacial, Torrejón de Ardoz, Madrid, Spain

    José Cernicharo Quintanilla

  4. Geophysical Lab., Carnegie Institution of Washington, Washington, District of Columbia, USA

    Henderson James Cleaves

  5. Astronomy Department, University of Massachusetts, Amherst, Massachusetts, USA

    William M. Irvine

  6. Dépt. Sc. de la Terre et de l’Atmosphère, Université du Québec, Montréal, Montreal, Québec, Canada

    Daniele Pinti

  7. Centre National d'Etudes Spatiale (CNES) DPI/E2U, Paris CX, France

    Michel Viso

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© 2014 Springer-Verlag Berlin Heidelberg

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Kobayashi, K. (2014). Proline. In: Amils, R., et al. Encyclopedia of Astrobiology. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27833-4_1282-4

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  • DOI: https://doi.org/10.1007/978-3-642-27833-4_1282-4

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Online ISBN: 978-3-642-27833-4

  • eBook Packages: Springer Reference Physics and AstronomyReference Module Physical and Materials ScienceReference Module Chemistry, Materials and Physics

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