Studies on the adsorption of peptides of glycine/alanine on montmorillonite clay with or without co-ordinated divalent cations

Kalra, Sippy; Pant, Chandra Kala; Pathak, Hilor; Mehata, Mohan Singh

doi:10.1016/s0927-7757(02)00288-1

Cited by 35 publications

(24 citation statements)

References 19 publications

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“…Rogacheva and Bobyrenko (1985) showed that adsorption of Leu (non-polar aliphatic R group) on titanium dioxide decreased with increased pH. On the other hand, Ben-Taleb et al (1994), Kalra et al (2000) and Basiuk (2002) found that the maximum adsorption of Ala as well as other amino acids on hematite (Ala, Gly, Lys, Thr, Glu), montmorillonite (Ala, Gly) and bare silica occurred close to their pI. Meng et al (2004) also observed that the adsorption of Gly (non-polar aliphatic R group) on silica was maximum at pH 6.00 (Gly, pI 5.97; Lehninger et al 1993).…”

Section: Resultsmentioning

confidence: 99%

Amino Acid Interaction with and Adsorption on Clays: FT-IR and Mössbauer Spectroscopy and X-ray Diffractometry Investigations

Benetoli

Souza

Silva

et al. 2007

Orig Life Evol Biosph

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In the present paper, the adsorption of amino acids (Ala, Met, Gln, Cys, Asp, Lys, His) on clays (bentonite, kaolinite) was studied at different pH (3.00, 6.00, 8.00). The amino acids were dissolved in seawater, which contains the major elements. There were two main findings in this study. First, amino acids with a charged R group (Asp, Lys, His) and Cys were adsorbed on clays more than Ala, Met and Gln (uncharged R groups). However, 74% of the amino acids in the proteins of modern organisms have uncharged R groups. These results raise some questions about the role of minerals in providing a prebiotic concentration mechanism for amino acids. Several mechanisms are also discussed that could produce peptide with a greater proportion of amino acids with uncharged R groups. Second, Cys could play an important role in prebiotic chemistry besides participating in the structure of peptides/proteins. The FT-IR spectra showed that the adsorption of amino acids on the clays occurs through the amine group. However, the Cys/clay interaction occurs through the sulfhydryl and amine groups. X-ray diffractometry showed that pH affects the bentonite interlayer, and at pH 3.00 the expansion of Cys/bentonite was greater than that of the samples of ethylene glycol/bentonite saturated with Mg. The Mössbauer spectrum for the sample with absorbed Cys showed a large increase ( approximately 20%) in ferrous ions. This means that Cys was able to partially reduce iron present in bentonite. This result is similar to that which occurs with aconitase where the ferric ions are reduced to Fe 2.5.

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Section: Resultsmentioning

confidence: 99%

Amino Acid Interaction with and Adsorption on Clays: FT-IR and Mössbauer Spectroscopy and X-ray Diffractometry Investigations

Benetoli

Souza

Silva

et al. 2007

Orig Life Evol Biosph

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“…Thus, it would seem that adsorption alone could indeed favor polymerization, although maybe not to the extent wished by de Duve and Miller (1991). Another relevant piece of work is the adsorption of (Gly) 2 , (Gly) 3 , and (Gly) 4 on montmorillonite clays by Kalra et al (2003). The Δ ads G°was positive (unfavorable) for (Gly) 2 (+0.9 to +1.1 kJ mol −1 ), close to zero for (Gly) 3 and slightly negative for (Gly) 4 (−0.6 to to −0.8 kJ mol −1 ).…”

Section: Polymerization During Adsorptionmentioning

confidence: 99%

Adsorption and Polymerization of Amino Acids on Mineral Surfaces: A Review

Lambert

2008

Orig Life Evol Biosph

385

376

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The present paper offers a review of recent (post-1980) work on amino acid adsorption and thermal reactivity on oxide and sulfide minerals. This review is performed in the general frame of evaluating Bernal's hypothesis of prebiotic polymerization in the adsorbed state, but written from a surface scientist's point of view. After a general discussion of the thermodynamics of the problem and exactly what effects surfaces should have to make adsorbed-state polymerization a viable scenario, we examine some practical difficulties in experimental design and their bearing on the conclusions that can be drawn from extant works, including the relevance of the various available characterization techniques. We then present the state of the art concerning the mechanisms of the interactions of amino acids with mineral surfaces, including results from prebiotic chemistry-oriented studies, but also from several different fields of application, and discuss the likely consequences for adsorption selectivities. Finally, we briefly summarize the data concerning thermally activated amide bond formation of adsorbed amino acids without activating agents. The reality of the phenomenon is established beyond any doubt, but our understanding of its mechanism and therefore of its prebiotic potential is very fragmentary. The review concludes with a discussion of future work needed to fill the most conspicuous gaps in our knowledge of amino acids/mineral surfaces systems and their reactivity.

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“…Greenland et al (1962Greenland et al ( , 1965 measured the free energy of adsorption as a function of chain length for glycine oligomers on montmorillonite and found the DDG to be $0.5 kcal/residue, while Kalra et al (2003) found a value of $ 0.2 kcal/ mol, significantly less than the 3.5 kcal/mol liberated upon peptide hydrolysis (Flegmann and Tattersall, 1979;Martin, 1998). Basiuk et al (1995) and Basiuk and Gromovoy (1996) found a similar energetic contribution per residue for the adsorption of oligoglycines on SiO 2 .…”

Section: Catalytic Activity Of Pyritementioning

confidence: 99%

Catalytic peptide hydrolysis by mineral surface: Implications for prebiotic chemistry

Marshall-Bowman

Ohara

Sverjensky

et al. 2010

Geochimica et Cosmochimica Acta

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Studies on the adsorption of peptides of glycine/alanine on montmorillonite clay with or without co-ordinated divalent cations

Cited by 35 publications

References 19 publications

Amino Acid Interaction with and Adsorption on Clays: FT-IR and Mössbauer Spectroscopy and X-ray Diffractometry Investigations

Amino Acid Interaction with and Adsorption on Clays: FT-IR and Mössbauer Spectroscopy and X-ray Diffractometry Investigations

Adsorption and Polymerization of Amino Acids on Mineral Surfaces: A Review

Catalytic peptide hydrolysis by mineral surface: Implications for prebiotic chemistry

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