Is it like the ids that start with 8 such as 8B4A is a recently deposited one like in the year 2024 and 3RZE is previously deposited like in 2009 or something
In the early days,frequently the letters were related to the name of the protein, and the number was increased for additional structures of the same protein, e.g. 1MBA for myoglobin, 1HBA for hemoglobin. Subsequent structures of the same protein got a higher number, e.g. 2MBA, 3MBA, 4 MBA etc.
As the available namespace started to fill up, they switched to assigning free IDs sequentially, hence the general tendency of newer structures to have higher numbers.
In the foreseeable future, they will reach 9ZZZ, and it is planned to switch to larger IDs: "PDB ID for the entry - currently 4-character alphanumeric, planned to be extended in the future to eight characters prefixed by ‘pdb’" https://www.rcsb.org/docs/general-help/identifiers-in-pdb
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