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I understand that bacterial chlorophylls are of the form a, b, c and d. But i read in my textbook about pigments like bacterio purpurin and bacterio viridin; are they a part of the 4 types of chlorophylls and if not how are they different and what actually are they?

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    $\begingroup$ What research have you done before asking it here? $\endgroup$ May 11, 2017 at 5:55
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    $\begingroup$ @another 'Homo sapien' i looked through a couple pages on the internet about bacterial photosynthetic pigments along with a wikipedia page and also a couple books but none of them were very clear about the relationship between bacterio purpurin/viridin and bacterio chlorophylls. Thus, my question is simply to ask for the relationship between them and if someone could explain the difference between $\endgroup$ May 11, 2017 at 6:10
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    $\begingroup$ Thanks for the question... me too unfamiliar with the term "bacterio-purpurin", however only recall the term "bacterio-viridin" in my old middle-school textbooks in context of photosynthetic pigments. I can't recall I've seen the terms anywhere else. Maybe they are obsoleted terms now replaced by some other terms. I'm not seeing these 2 terms in wikipedia, too. $\endgroup$
    – user25568
    May 11, 2017 at 7:01

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From A search in Pubchem database, in substances for bacterioviridin, it seems just another synonym for bacteriochlorophyll-C.

Screenshot with synonymy.

The incomplete page do not show any image-entry. From another entry about bacteriochlorophyll-C, I've took the following image:

Bacteriochlorophyll-C Bacteriochlorophyll-C; which is being told same as Bacterioviridin

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From similar search on same website for bacteriopurpurin, it shows,

Bacteriopurpurin-a xanthophyll compound according to pubchem

is a Xanthophyll compound; with another similar entry Bacteriopurpurin

It is also being called Hydroxyspirilloxanthin

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shows this photo:

Bacteriopurpurine-18 is a porphyrine compound according to Pubchem

Which is clearly a porphyrin-type compound (With smaller 4 pyrrole-type rings) with nitrogen (N) atoms.

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Though you have not mentioned in the original question, another such old term is Chlorobium-chlorophyll. When searched ; there i could found one entry in the PubChem database, about chlorobium chlorophyll; which tells; it is same as bacteriochlorophyll-D, though the incomplete page does not display any structure.

From some other entry about bacteriochlorophyll-d; the structure given here:

Bacteriochlorophyll-D Bacteriochlorophyll-D, which is being told same as chlorobium chlorophyll. Look this has a little bit different structure from bacteriochlorophyll-C (bacterioviridin according to pubchem) , because chlorophyll-D (this) is lacking a methyl group at left hand middle side of the photo.

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However, I cannot ensure they are free from nomenclatural conflicts. IMO it is better to use modern terms like bacteriochlorophyll-a, b, c, d, e, f and g.

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Reference: The PubChem Project by NCBI

  • The Pubchem Project

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N.B. :

To quickly find differences among some main types of chlorophylls and bacteriochlorophylls; I've attached the following diagram. Most of the pictures are taken from PubChem; two I couldn't found in Pubchem, so I took them from a PMC articles. All are linked below the diagram.

Comparisons among chlorophylls and bacteriochlorophylls
Comparisons among some chlorophylls and bacteriochlorophylls.

Sources:

The PMC Article * : Bacteriochlorophyll f: properties of chlorosomes containing the “forbidden chlorophyll”, by Vogl, Tank, Orf, Blankenship, Bryant.

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    $\begingroup$ thanks for taking the time to go through pubchem, but as it seems bacterio purpurin is still doubtful and do you have any idea about a similarity between chlorobium chlorophyll and bacterio viridin, are they synonymous? $\endgroup$ May 11, 2017 at 11:03
  • $\begingroup$ Not showing synonymous. I've started already adding info about chlorobium chlorophyll $\endgroup$
    – user25568
    May 11, 2017 at 11:06
  • $\begingroup$ @AnamikaGhosh Thanks very much for asking the question... otherwise the fact behind some mysterious terms would remain unknown to me. $\endgroup$
    – user25568
    May 12, 2017 at 6:35
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    $\begingroup$ So, what's the conclusion here? Is bacteriopurpurin a type of bacteriochlorophyll? $\endgroup$ Jun 25, 2020 at 11:08
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    $\begingroup$ According to the PubChem entry Bacteriopurpurin can't be a chlorophyll. It has a different structure. $\endgroup$
    – user25568
    Jul 11, 2020 at 16:51

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