Linked Life Data

2601338

Source:http://linkedlifedata.com/resource/pubmed/id/2601338

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
1990-2-1
pubmed:abstractText
Members of the genus Botryosphaerica are reported 7 alpha steroid hydroxylators [1]. We found that the species B. obtusa efficiently hydroxylated progesterone in a 1-day transformation but it gave 7 beta-hydroxyprogesterone as the main product rather than the expected 7 alpha-hydroxy isomer, which was produced in only trace amounts. Also formed in minor amounts were 6 beta-, possibly 9 alpha- (see main text), 14 alpha- and 15 beta-monohydroxyprogesterones. The transformation mixtures included appreciable amounts of dihydroxylated progesterones which were mainly based on 7 beta-hydroxyprogesterone. The second hydroxyl group was at one of the minor monohydroxylation sites. The relative concentrations of the progesterone diols increased and those of the mono-alcohols concomitantly decreased when transformation was extended beyond 1 day. Monohydroxylated 6-dehydroprogesterones began to accumulate after about 3 days and these compounds seemed to have been formed by 6,7-dehydration of the dihydroxyprogesterones. We prepared mycelial cell-free extracts which were capable of transforming progesterone and retained the site-specificity of whole cells. These extracts converted 7 beta-hydroxyprogesterone to its 6-dehydro derivative, confirming that ring B desaturation occurs in this organism by dehydration. The dehydratase activity necessary for the conversion was separable from the hydroxylase activity by ultra-centrifugation. All hydroxylase activity co-sedimented with the membrane fraction, implying that steroid hydroxylation is effected by a membrane-bound enzyme(s). Dehydratase activity was present in both the pellet and the supernatant fractions, which suggests that it may involve a loosely bound, and easily removed, membrane-associated enzyme.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Nov
pubmed:issn
0022-4731
pubmed:author
pubmed:issnType
Print
pubmed:volume
33
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
927-34
pubmed:dateRevised
2010-8-25
pubmed:meshHeading
pubmed:year
1989
pubmed:articleTitle
Microbial transformations of steroids--V. Transformation of progesterone by whole cells and extracts of Botryosphaerica obtusa.
pubmed:affiliation
School of Biological Sciences, Queen Mary College, London, U.K.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't