Origin Story Of The First Proteins

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Discussion Overview

The discussion revolves around the origins of the first proteins, particularly questioning how proteins could arise given that the processes for their synthesis involve proteins themselves, as outlined by the central dogma of molecular biology. Participants explore various hypotheses and theories related to the emergence of life and protein synthesis, including the role of RNA and alternative information carriers.

Discussion Character

  • Exploratory
  • Debate/contested
  • Conceptual clarification

Main Points Raised

  • Some participants note that the central dogma implies a need for pre-existing proteins for protein synthesis, raising the question of how the first proteins originated.
  • Others mention that RNA can catalyze reactions and suggest that early protein synthesis may have been facilitated by RNA rather than proteins.
  • A participant proposes a "bootstrap" concept for initial biology, suggesting that early life forms may have used simpler information carriers that could hold information, self-replicate, and evolve, rather than complex structures like RNA or DNA.
  • Some participants express dissatisfaction with the idea that "nobody knows" and encourage the sharing of self-made hypotheses, while others emphasize the importance of citing known research and avoiding speculation.
  • There is mention of the "RNA world" hypothesis, which posits that life began with self-replicating RNA molecules, and references to ongoing research in this area.
  • Several participants engage in a meta-discussion about the appropriateness of speculation in the context of the forum's educational goals, with some advocating for a more cautious approach to discussing unknowns in science.

Areas of Agreement / Disagreement

Participants express a mix of opinions, with some advocating for speculation and others insisting on a more research-based approach. There is no consensus on whether speculation is appropriate in this context, and the discussion remains unresolved regarding the origins of the first proteins.

Contextual Notes

Participants highlight limitations in current understanding and the complexity of the topic, noting that many aspects of the origin of life and protein synthesis remain speculative and not fully understood.

Navin
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Now i had a question,but before that look at this.

Now by the central dogma
DNA is transcribed by RNA polymerase onto mRNA and this leads to translation which creates Protiens.

But hold on...The polymerase itself is an enzyme ie ;a protein .

So to make proteins...you need proteins aldredy present in the body...so

How did the first proteins ever come to be !
 
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Navin said:
So what are your opinions.
I would note that the minimum "bootstrap" s some thing that can:
1) Holds information (at least thousands of bits);
2) Will self-replicate - even given months or years and a very favorable environment.
3) Can evolve.

So the initial biology may not have had anything as luxurious as RNA, DNA, or mRNA. There may be other information carriers that go unrecognized because they as so inefficient.

Since the OP wants "opinions" (aka, speculation), should this stay under the "Biology" heading?
 
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.Scott said:
I would note that the minimum "bootstrap" s some thing that can:
1) Holds information (at least thousands of bits);
2) Will self-replicate - even given months or years and a very favorable environment.
3) Can evolve.

So the initial biology may not have had anything as luxurious as RNA, DNA, or mRNA. There may be other information carriers that go unrecognized because they as so inefficient.
Thats an exccelant point.
 
@Navin
Its always fun to spit out self made hypotheses !

No! It is okay on Reddit. Not here. We are an educational site, not meant for speculation, so please do not hypothesize from ignorance, just cite known research.

And no, @.Scott. This thread is going for a one way trip to general discussion. And if becomes too speculative the mentors there will take additional action.
 
Navin said:
im not satisfied with the usual "no one knows answer"

Too bad. In science, if we don't know, we say we don't know. We don't make stuff up.
 
Navin said:
Its always fun to spit out self made hypotheses !

You might want to read the PF Rules that you had agreed to before you have way too much fun.

Zz.
 
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RNA is capable of catalyzing reactions, no need for proteins.
 
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  • #10
Navin said:
Now i had a question,but before that look at this.

Now by the central dogma
DNA is transcribed by RNA polymerase onto mRNA and this leads to translation which creates Protiens.

But hold on...The polymerase itself is an enzyme ie ;a protein .

So to make proteins...you need proteins aldredy present in the body...so

How did the first proteins ever come to be !

Protein synthesis occurs on the ribosome, and while the modern ribosome does contain protein, protein synthesis seems to be catalyzed only by RNA. So, it is plausible in prebiotic times, protein synthesis (or at least peptide synthesis) was catalyzed by RNA.

In fact, as others in this thread have alluded to, RNA is a very versatile molecule capable of both storing genetic information (e.g. many modern viruses like the influenza virus store their genetic information as RNA) as well as serving as catalysts (ribozymes). These facts led scientists to come up with the "RNA world" hypothesis, which envisions that life began as self-replicating RNA molecules. To demonstrate the feasibility of this hypothesis, scientists have been making attempts at engineering self-replicating RNAs in the lab (see, for example, this PF thread discussing the topic: https://www.physicsforums.com/threads/amplification-of-rna-by-an-rna-polymerase-ribozyme.882293/).

For some speculation about the origin of proteins, see my post here: https://www.physicsforums.com/threads/how-did-proteins-evolve.927139/#post-5852459

See this PF thread for more discussion of theories around abiogenesis: https://www.physicsforums.com/threads/which-was-the-origin-dna-rna-or-protein.562096/
 
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  • #11
Okay
jim mcnamara said:
@NavinNo! It is okay on Reddit. Not here. We are an educational site, not meant for speculation, so please do not hypothesize from ignorance, just cite known research.

And no, @.Scott. This thread is going for a one way trip to general discussion. And if becomes too speculative the mentors there will take additional action.

Vanadium 50 said:
Too bad. In science, if we don't know, we say we don't know. We don't make stuff up.
On secand thought let not continue this.

They are right.
This is afterall an education site and speculations may mislead someone who has no idea about what's going on

So let's end it at " We don't know"

Science is absolute and can't dwell into fantasy.

But i still feel we can't just take such stuff for granted though.
We can't just always say "we don't know" and neither do i think people should supress opinions.
There is an answer out there and there are bright minds with fancy degrees on this site.
 
  • #12
Navin said:
There is an answer out there and there are bright minds with fancy degrees

And you can be sure they are not wasting their time, but researching :smile: Just because they don't know as of yet doesn't mean they will not make progress. There is no guarantee we will know everything though.
 
  • #13
Wait a minute since this thread has been shifted to general discussion (atleast thsts what my device tells me) is it now safe to continue speculations ?
jim mcnamara said:
@NavinNo! It is okay on Reddit. Not here. We are an educational site, not meant for speculation, so please do not hypothesize from ignorance, just cite known research.

And no, @.Scott. This thread is going for a one way trip to general discussion. And if becomes too speculative the mentors there will take additional action.

Im kinda new actually...
 
  • #14
Navin said:
is it now safe to continue speculations ?

No.
 
  • #15
Fine..fine...(looks enviously at those darn Reddit users)
[IT WAS A JOKE ! A JOKE ! Noo don't ban me noo-"]
 

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