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What keeps polyhydroxyalkanoates in bacterial cells amorphous? A derivation from stress exposure experiments.

Abstract：

:Polyhydroxyalkanoates (PHA) are storage polymers accumulated by numerous prokaryotes in form of intracellular granules. Native PHA granules are formed by amorphous polymer which reveals considerably higher elasticity and flexibility as compared to crystalline pure PHA polymers. The fact that bacteria store PHA in amorphous state has great biological consequences. It is not clear which mechanisms protect amorphous polymer in native granules from transition into thermodynamically favorable crystalline state. Here, we demonstrate that exposition of bacterial cells to particular stressors induces granules aggregation, which is the first but not sufficient condition for PHA crystallization. Crystallization of the polymer occurs only when the stressed bacterial cells are subsequently dried. The fact that both granules aggregation and cell drying must occur to induce crystallization of PHA indicates that both previously suggested hypotheses about mechanisms of stabilization of amorphous state of native PHA are valid and, in fact, both effects participate synergistically. It seems that the amorphous state of the polymer is stabilized kinetically by the low rate of crystallization in limited volume in small PHA granules and, moreover, water present in PHA granules seems to function as plasticizer protecting the polymer from crystallization, as confirmed experimentally for the first time by the present work.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Sedlacek P,Slaninova E,Enev V,Koller M,Nebesarova J,Marova I,Hrubanova K,Krzyzanek V,Samek O,Obruca S

doi

10.1007/s00253-018-09584-z

subject

Has Abstract

pub_date

2019-02-01 00:00:00

pages

1905-1917

issue

4

eissn

0175-7598

issn

1432-0614

pii

10.1007/s00253-018-09584-z

journal_volume

103

pub_type

杂志文章

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